Rust backend for Peptonizer2000

[SimonVandeVyver]

This PR adds a complete Rust backend for Peptonizer2000 and wires it into the full package ecosystem.

• Implements the core algorithm in Rust under peptonizer_rust/, with native and WASM build targets
• Adds a Rust/WASM integration layer so peptonizer_ts can consume the compiled WebAssembly build
• Adds Python package support for peptonizer_rust using pyo3 and maturin
• Adds support for building wheels for all major platforms
• Updates the Snakemake workflow environment to find local peptonizer_rust wheel artifacts
• Updates README installation and troubleshooting instructions for the Rust wheel build path
• Integrates the Rust backend across the repo so the package now uses the new implementation throughout the Python workflow, frontend, and packaging pipeline

[pverscha]

I have reviewed and tested the changes in this PR. Overall very nice work, thank you!

I do have some remarks that you should take a look at before we can continue and merge this PR:

• The tests for Rust do not succeed. This is the error that is generated when running cargo test in the peptonizer_rust directory:

error[E0425]: cannot find function `parse_taxon_scores` in this scope
  --> src/zero_lookahead_belief_propagation.rs:55:20
   |
55 |         let json = parse_taxon_scores(csv_content);
   |                    ^^^^^^^^^^^^^^^^^^ not found in this scope

• Continueing with the tests, I think it would be good if we could also implement a GitHub Action workflow that automatically runs the Rust tests on push to the repo.

I have also left some comments directly onto the code, please take a look at those as well.