Make pcodec compatible with numcodecs

[LDeakin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.49%. Comparing base (630c71e) to head (e88ef61).

Files	Patch %	Lines
.../array/codec/array_to_bytes/pcodec/pcodec_codec.rs	33.33%	2 Missing ⚠️
src/metadata/v3/codec/pcodec.rs	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   81.48%   81.49%   +0.01%     
==========================================
  Files         153      153              
  Lines       21088    21102      +14     
==========================================
+ Hits        17184    17198      +14     
  Misses       3904     3904              

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