[Refactor] Phaseout LLVM Dependency by Making it Optional (#247)

* remove llvm build

* [Refactor] Update kernel compilation and profiling in examples

- Replaced `tilelang.lower` with `tilelang.compile` in multiple example scripts to streamline kernel compilation.
- Updated profiling calls to utilize the new `get_profiler` method, enhancing performance measurement consistency.
- Adjusted assertions and benchmarking methods to align with the new profiling structure across various examples, ensuring correctness and clarity in performance evaluations.

* lint fix

* License Update

* [Refactor] Improve code formatting and documentation in CUDA header and HIP runtime files

- Adjusted formatting in `cuda.h` for better readability, including alignment of comments and struct fields.
- Cleaned up whitespace and improved comment clarity in `rt_mod_hip.cc` to enhance code maintainability.

* [Refactor] Enhance formatting and clarity in CUDA header and HIP runtime files

- Improved comment alignment and readability in `cuda.h`.
- Cleaned up whitespace and formatting in `rt_mod_hip.cc` to enhance maintainability.

* lint fix

* lint fix

* lint fix

* lint fix

* fix

* License update

* [Enhancement] Update JITKernel to use artifact for kernel source

- Assigned the generated artifact to `self.artifact` for better management.
- Updated kernel source references to use `artifact.kernel_source` for consistency in execution backend handling.

* lint fix

* Add @tilelang.testing.requires_llvm decorator to vectorization tests

* Enhance setup.py and env.py for library management

- Added functionality to remove original files after copying in CMakeBuild.
- Updated TVM_LIBRARY_PATH in env.py to include the PyPI build library path for better integration.

* Refactor TVM_LIBRARY_PATH assignment for improved readability in env.py

* Refactor CMakeBuild file handling in setup.py

- Added a check to ensure the target library directory exists before copying .so files.
- Improved the logic for creating the target directory and copying files to enhance robustness.

* bugfix

* Rename BuildTLDebug to BuildTileLangCUDAWithoutCompile and update registration. Add @tilelang.testing.requires_llvm decorator to multiple tests for LLVM requirement.

* lint fix

* Enhance TileLang code generation by adding support for device code generation without compilation. Updated `host_codegen` and `device_codegen` functions to include new transformations and registration for `tilelang_hip_without_compile`. Refactored JIT kernel adapters to accommodate host and device modules, improving overall integration and flexibility.

* lint fix

* Add support for C target in device code generation

- Updated `device_codegen_without_compile` to include handling for the C target by registering the `tilelang_cpp` function.

* [Enhancement] Implement auto-clear cache feature based on environment variable

* Added TILELANG_CLEAR_CACHE environment variable to control cache clearing.
* Updated CI workflow to set TILELANG_CLEAR_CACHE during testing.
* Modified cache initialization to clear cache if TILELANG_CLEAR_CACHE is set to true.

* [Refactor] Update kernel invocation and import paths in tests and cache

* Changed kernel invocation in `test_tilelang_kernel_dequantize_gemm.py` to return the result.
* Updated import statements in `test_tilelang_kernel_int4_gemm_mma.py` to use `bitblas` instead of `tilelang`.
* Refactored paths for artifact and parameters in `kernel_cache.py` for better maintainability.

* [Refactor] Clean up whitespace and improve code formatting in kernel_cache.py

* Removed unnecessary blank lines and adjusted spacing for better readability in the KernelCache class.
* Enhanced overall code formatting to align with project standards.

* [Enhancement] Add bfloat16 test case and improve kernel caching logic

* Introduced a new test case for bfloat16 matrix multiplication in `test_tilelang_kernel_gemm_mma_intrinsic.py`.
* Updated `KernelCache` to handle multiple kernel source files and improve error handling during saving and loading.
* Refactored `JITKernel` to support instantiation from a database, enhancing flexibility in kernel management.
* Adjusted `CtypesKernelAdapter` and `CythonKernelAdapter` to utilize the new kernel loading mechanism from the database.
* Improved code formatting and readability across several files.

* lint fix

* Update bfloat16 matrix multiplication test case to use larger dimensions for improved coverage

tilelang/primitives/gemm/gemm_mma.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 from dataclasses import dataclass
 from tvm import tir
 import tilelang.language as T

tilelang/testing/__init__.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
 import sys
 import inspect
 import pytest

tilelang/tools/__init__.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 from .plot_layout import plot_layout  # noqa: F401

tilelang/tools/plot_layout.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 import tilelang.language as T
 
 

tilelang/transform/__init__.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
 """Wrapping transformations."""
 # pylint: disable=invalid-name, unsupported-binary-operation
 

tilelang/transform/_ffi_api.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
 """FFI APIs for tilelang"""
 
 import tvm._ffi

tilelang/transform/simplify.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
 from tilelang import tvm as tvm
 from tvm import IRModule
 from tvm.tir import PrimFunc

tilelang/utils/__init__.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
 """The profiler and convert to torch utils"""
 
 from .target import determine_target  # noqa: F401

tilelang/utils/language.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 from tvm.tir import Buffer
 from typing import List
 from functools import reduce

tilelang/utils/target.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 from typing import Literal, Union
 from tilelang import tvm as tvm
 from tvm.target import Target

tilelang/version.py

-# Copyright (c) Microsoft Corporation.
-# Licensed under the MIT License.
-
 import os
 
 # Get the absolute path of the current Python script's directory