chore: Don't depend on openssl (#292)

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.

Author: grahamking

.github/workflows/pre-merge-rust.yml

@@ -84,7 +84,7 @@ jobs:
       working-directory: ${{ matrix.dir }}
       run: |
         cargo-deny --version || cargo install [email protected]
-        cargo-deny --no-default-features check --hide-inclusion-graph licenses --config ${{ github.workspace }}/deny.toml
+        cargo-deny --no-default-features check --hide-inclusion-graph licenses bans --config ${{ github.workspace }}/deny.toml
     - name: Run Unit Tests
       working-directory: ${{ matrix.dir }}
       run: cargo test --locked --all-targets