Add option single_ob to HDF5Merger for merging chunks of the same ob

[maxnoe]

Needed for merging of observations that are stored in multiple chunks into one final file for the OB.

TODO:

• Add test

[kosack]

Is an option really needed for this? I would think the default behavior should just be updated to not duplicate an OB if it already exists.

[maxnoe]

Is an option really needed for this? I would think the default behavior should just be updated to not duplicate an OB if it already exists.

That could be done, yes. Depends a bit on the use case, e.g. we might want to check for uniqueness of obs_id and error out if not single_ob to prevent people from merging the same file twice or merging two simulation files that are different but have the same run number

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4a45dcd) 92.46% compared to head (4c334bf) 92.46%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2436   +/-   ##
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  Coverage   92.46%   92.46%           
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  Files         234      234           
  Lines       19868    19872    +4     
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+ Hits        18370    18374    +4     
  Misses       1498     1498           

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