Enable environment variable based configuration for ML Worker Manager

[AlyssaCote]

This PR adds a EnvironmentConfigLoader, which loads and deserializes an SSFeatureStore and an SSQueue from environment variables for the ML Worker Manager.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Please upload report for BASE (mli-feature@8a2f173). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...tsim/_core/mli/infrastructure/environmentloader.py	0.00%	20 Missing ⚠️
...e/mli/infrastructure/storage/dragonfeaturestore.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             mli-feature     #621   +/-   ##
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  Coverage               ?   67.48%           
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  Files                  ?       96           
  Lines                  ?     6627           
  Branches               ?        0           
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  Hits                   ?     4472           
  Misses                 ?     2155           
  Partials               ?        0           

Files with missing lines	Coverage Δ
...e/mli/infrastructure/storage/dragonfeaturestore.py	0.00% <0.00%> (ø)
...tsim/_core/mli/infrastructure/environmentloader.py	0.00% <0.00%> (ø)

[ankona]

LGTM!