WIP: Enable reading groups from HDF5

[weiji14]

Allow hidefix to read groups in a HDF5 file.

Currently just adding a placeholder unit test that lists the group member names, and added a sample HDF5 file (will delete it or find a smaller one later). I'll refactor this PR once I get my head around Rust a bit more, but feel free to leave comments/suggestions.

Towards fixing #24.

References:

• https://docs.rs/hdf5/latest/hdf5/struct.Group.html#method.group

[codecov-commenter]

Codecov Report

Merging #28 (87f7756) into main (0e63714) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main      #28   +/-   ##
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  Coverage   57.00%   57.00%           
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  Files          21       21           
  Lines        1056     1056           
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  Hits          602      602           
  Misses        454      454           

[gauteh]

Sounds good, I also sometimes download the file during the test: https://github.com/gauteh/hidefix/blob/main/tests/read_norkyst.rs#L12, but those files are much bigger than this one. You could also even generate it using the native hdf5 bindings.

[weiji14]

Sorry, was away with a few conferences/trips the past couple of months, so haven't managed to find time to work on this. I see that there's another PR at #31 now, so happy for that to go ahead and close this one if needed.

[gauteh]

Yeah, I think that one is probably further ahead: but it became outdated after some other changes, so it requires some work before it can be merged (otherwise it is ready).

[gauteh]

Closed in favor of #31.