ENH: make copy before overwriting, add compression in to_odim

[kmuehlbauer]

• [ ] Closes #xxxx
• [x] Tests added
• [x] Changes are documented in history.md

This fixes an issue when writing to_odim if the underlying data array's write flag wasn't set. It also adds the capability to add compression/compression_opts kwargs in the call to to_odim.

The latter makes it very easy and convenient to use the zoo of compressors available to hdf5. Please refer to http://www.silx.org/doc/hdf5plugin/latest/index.html for usage examples.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@a0a419f). Click here to learn what that means. The diff coverage is 100.00%.

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  Coverage        ?   88.17%           
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  Hits            ?     2900           
  Misses          ?      389           
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Flag	Coverage Δ
unittests	88.17% <100.00%> (?)

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Impacted Files	Coverage Δ
xradar/io/export/odim.py	96.55% <100.00%> (ø)

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