Converter for MDIO dataset spec to Xarray Dataset and serialize it to Zarr

[dmitriyrepin]

Outstanding work

• Add more unit tests for internal functions
• Add a test comparing expected and actual .zmetadata for the serialized dataset

[tasansal]

looks good! i put in lots of nitpick

[codecov]

Codecov Report

Attention: Patch coverage is 92.46753% with 29 lines in your changes missing coverage. Please review.

Project coverage is 90.60%. Comparing base (0195bb1) to head (d08e2c4).
Report is 190 commits behind head on v1.

Files with missing lines	Patch %	Lines
tests/unit/v1/test_dataset_serializer.py	92.62%	15 Missing and 1 partial ⚠️
src/mdio/schemas/v1/dataset_serializer.py	91.79%	3 Missing and 8 partials ⚠️
tests/unit/v1/helpers.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v1     #571      +/-   ##
==========================================
+ Coverage   84.32%   90.60%   +6.28%     
==========================================
  Files          46       72      +26     
  Lines        2194     3948    +1754     
  Branches      305      278      -27     
==========================================
+ Hits         1850     3577    +1727     
- Misses        301      304       +3     
- Partials       43       67      +24     

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