Add explicit store close to resources

[munrojm]

This PR ensures the store connection are explicitly closed in reach resource class after a query is executed.

[codecov]

Codecov Report

Patch coverage: 92.30% and no project coverage change.

Comparison is base (e2daca3) 88.12% compared to head (36434d7) 88.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   88.12%   88.12%           
=======================================
  Files          44       44           
  Lines        3620     3630   +10     
=======================================
+ Hits         3190     3199    +9     
- Misses        430      431    +1     

Impacted Files	Coverage Δ
src/maggma/api/API.py	81.81% <ø> (-0.41%)	⬇️
src/maggma/api/query_operator/dynamic.py	94.28% <ø> (ø)
src/maggma/api/query_operator/pagination.py	96.00% <ø> (ø)
src/maggma/api/query_operator/submission.py	95.45% <ø> (ø)
src/maggma/api/resource/aggregation.py	89.58% <ø> (ø)
src/maggma/api/resource/core.py	80.00% <ø> (ø)
src/maggma/api/resource/s3_url.py	58.00% <0.00%> (-1.19%)	⬇️
src/maggma/api/resource/utils.py	80.76% <0.00%> (ø)
src/maggma/builders/group_builder.py	84.31% <ø> (ø)
src/maggma/cli/source_loader.py	70.11% <0.00%> (ø)
... and 16 more

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