Remove h5py as required dependency

[ghiggi]

Prework

• [x] I understand and agree to this repository's code of conduct.
• [x] I understand and agree to this repository's contributing guidelines.
• [ ] I have already submitted an issue or discussion thread to discuss my idea with the maintainers.

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [ ] Feature
• [ ] Documentation
• [ ] Tutorial
• [ ] Code style update
• [x] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [x] Yes
• [x] No

If yes, please describe the impact and communicate accordingly:

The PR fulfills these requirements:

• [x] It's submitted to the branch named as follow:
  • Fix a bug: bugfix-<some_key>-<word>
  • Improve the doc: doc-<some_key>-<word>
  • Improve a tutorial tutorial-<some_key>-<word>
  • Add a new feature: feature-<some_key>-<word>
  • Refactor some code: refactor-<some_key>-<word>
  • Optimize some code: optimize-<some_key>-<word>
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] Don't forget to link PR to issue if you are solving one.
• [x] All tests are passing.
• [ ] New/updated tests are included

Summary

Remove h5py as core dependency. Use xarray netcdf4 engine for all read operations.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.66%. Comparing base (c468afe) to head (61acf26).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #51 +/- ## ======================================= Coverage 87.66% 87.66% ======================================= Files 111 111 Lines 10520 10520 ======================================= Hits 9222 9222 Misses 1298 1298 ```

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[coveralls]

coverage: 87.662%. remained the same when pulling 61acf26de9790e7982df4deaa13eba7c8b5b1e44 on refactor-h5py-use into c468afe802244e12d0dac91106fda0f226db7e57 on main.