Add ocf blosc2 compression

[devsjc]

For issue #57

[codecov[bot]]

Codecov Report

Merging #80 (8fda5e1) into main (96f8755) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   93.73%   93.75%   +0.01%     
==========================================
  Files           6        6              
  Lines         335      336       +1     
==========================================
+ Hits          314      315       +1     
  Misses         21       21              

Impacted Files	Coverage Δ
metofficedatahub/multiple_files.py	93.23% <100.00%> (+0.05%)	:arrow_up:

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