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This makes the Rust parts all use ring / rustls library instead of local install of openssl. It's a step on the journey to being statically linked.

Pieces:
- `tokenizers` and `mistralrs` now support rustls (mistralrs by default, tokenizers with feature flag).
- Move shared dependencies up into workspace
- New `rand` crate has some renames for future rust
- Ensure the dependency doesn't creep back in by enforcing it with cargo deny.

Co-authored-by: Meenakshi Sharma <163925564+nvda-mesharma@users.noreply.github.com>

Engines mistralrs, sglang and vllm included by default. Can be disabled like this: `cargo build --no-default-features --features <add-back-what-you-want>`.

Added `--feature vulkan` option, for llamacpp.

Build time message if CUDA or Metal would help and are missing. That's the best we can do:
> warning: dynamo-run@0.1.0: CUDA not enabled, re-run with `--features cuda`

Runtime message if CUDA, Metal or Vulkan are enabled:
> 2025-03-14T21:59:26.501937Z  INFO dynamo_run: CUDA on

Runtime message if they are missing:
> 2025-03-14T22:02:37.439404Z  INFO dynamo_run: CPU mode. Rebuild with `--features cuda|metal|vulkan` for better performance

Defaut engine message includes available engines:
> 2025-03-14T21:59:26.503612Z  INFO dynamo_run: Using default engine: mistralrs. Use out=<engine> to specify one of echo_core, echo_full, mistralrs, llamacpp, sglang, vllm, pystr, pytok

The really important outcome is that this should now "just work":
```
cargo install dynamo-run
dynamo-run Qwen/Qwen2.5-3B-Instruct
```

Sadly you still need `--features cuda|metal` for performance, I couldn't automate that.

Co-authored-by: Meenakshi Sharma <163925564+nvda-mesharma@users.noreply.github.com>

Co-authored-by: Biswa Panda <biswa.panda@gmail.com>

Co-authored-by: Graham King <grahamk@nvidia.com>