Rust API documentation

[Choochmeque]

Description

Added rust api documentation

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

🌦️ >> Documentation << 🌦️
https://sites.ecmwf.int/docs/dev-section/ecflow/pull-requests/PR-472

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.26%. Comparing base (fd231b7) to head (d9d9981).
⚠️ Report is 5 commits behind head on rust-bindings.

Additional details and impacted files

@@                Coverage Diff                @@
##           rust-bindings     #472      +/-   ##
=================================================
+ Coverage          56.23%   56.26%   +0.02%     
=================================================
  Files               1268     1268              
  Lines             105366   105366              
  Branches           15374    15374              
=================================================
+ Hits               59248    59279      +31     
+ Misses             46118    46087      -31     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.