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**Description**
Add return_code metric into result and revise unit tests.

**Description**
If `ignore_invalid` is True, and 'required' arguments are not set when register the benchmark, the arguments should be provided by user in config and skip the arguments checking.

* Clean up the cache.

* Benchmarks: Add Feature - Add interface to get all predefine parameters of all benchmarks.

Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

* fix raw data validation bug.
* address comments.
Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

Benchmarks: Code Revision - Revise BenchmarkRegistry interfaces for integration with executor. (#33)

* revise BenchmarkRegistry interfaces.
* address comments
Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

* benchmarks init.
Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>