S3 store and resource additions

[munrojm]

This PR:

• Allows raw msgpacked and compressed S3 object data to be returned directly through the S3 store
• Introduces S3URLResource for serving up pre-signed object URLs in S3

[codecov]

Codecov Report

Merging #635 (9cd5db3) into main (6adef9b) will decrease coverage by 0.49%.
The diff coverage is 75.28%.

@@            Coverage Diff             @@
##             main     #635      +/-   ##
==========================================
- Coverage   89.46%   88.96%   -0.50%     
==========================================
  Files          40       41       +1     
  Lines        2828     2891      +63     
==========================================
+ Hits         2530     2572      +42     
- Misses        298      319      +21     

Impacted Files	Coverage Δ
src/maggma/api/resource/s3_url.py	59.18% <59.18%> (ø)
src/maggma/api/utils.py	95.71% <85.71%> (-1.31%)	⬇️
src/maggma/stores/aws.py	91.66% <95.65%> (+0.25%)	⬆️
src/maggma/api/models.py	90.47% <100.00%> (+1.00%)	⬆️
src/maggma/api/resource/__init__.py	100.00% <100.00%> (ø)
src/maggma/api/resource/read_resource.py	95.29% <100.00%> (ø)

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[lgtm-com]

This pull request introduces 3 alerts when merging 1f88339 into c393da8 - view on LGTM.com

new alerts:

• 3 for Unused import