Add utility function datablock_to_astropy

[joezuntz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.24%. Comparing base (5c5d1b5) to head (95a8cd5).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
cosmosis/test/test_utils.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   61.94%   62.24%   +0.29%     
==========================================
  Files         117      117              
  Lines       12470    12575     +105     
==========================================
+ Hits         7725     7827     +102     
- Misses       4745     4748       +3     

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