Add testing jobs for rust

[ThomasTNO]

Key Features of This Workflow:

1. Workspace Support:

   • The --workspace flag ensures that commands like cargo build, cargo test, and cargo tarpaulin operate on all crates in the Rust workspace.

2. Matrix Builds:

   • Tests are executed on both stable and nightly versions of Rust to ensure compatibility.

3. Code Coverage Without External Services:

   • The workflow uses cargo-tarpaulin to generate a local HTML coverage report stored as an artifact (./coverage-report/).
   • You can download this artifact from GitHub Actions after the workflow completes.

4. Linting and Formatting:

   • Ensures code quality by running cargo fmt and cargo clippy.

5. Caching:

   • Speeds up builds by caching dependencies (~/.cargo/registry, ~/.cargo/git) and build artifacts (target).

6. Artifacts:

   • The generated HTML coverage report is uploaded as an artifact so it can be reviewed or downloaded directly from GitHub Actions.

[github-actions]

Sigrid maintainability feedback

⏸️️ Your rating did not change and is still below your objective of 4.0 stars

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Sigrid compared your code against the baseline of 2024-11-28.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

You did not introduce any technical debt during your changes, great job!

📚 Remaining technical debt

27 refactoring candidates didn't get better or worse, but are still present in the code you touched.

View this system in Sigrid** to explore your technical debt

⭐️ Sigrid ratings

System property	System on 2024-11-28	Before changes	New/changed code
Volume	5.4	N/A	N/A
Duplication	4.0	4.7	4.7
Unit Size	2.1	1.6	1.4
Unit Complexity	2.9	2.3	2.3
Unit Interfacing	2.0	1.4	1.3
Module Coupling	3.3	5.5	5.5
Component Independence	5.4	N/A	N/A
Component Entanglement	N/A	N/A	N/A
Maintainability	3.6	3.3	3.3

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[ThomasTNO]

@grebnetiew, I added some common Rust jobs including building, linters and unit testing (+coverage report artifact)