Use brief explain stats

[mkindahl]

Use a more compact and easy to read version for the decompression and arrow array cache stats and simplify the code.

Disable-check: force-changelog-file

[codecov]

Codecov Report

Attention: Patch coverage is 44.82759% with 16 lines in your changes missing coverage. Please review.

Project coverage is 82.53%. Comparing base (59f50f2) to head (8f68c55).
Report is 554 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/hypercore/arrow_cache_explain.c	44.82%	11 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7355      +/-   ##
==========================================
+ Coverage   80.06%   82.53%   +2.46%     
==========================================
  Files         190      228      +38     
  Lines       37181    42571    +5390     
  Branches     9450    10696    +1246     
==========================================
+ Hits        29770    35136    +5366     
- Misses       2997     3168     +171     
+ Partials     4414     4267     -147     

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