Add FeatureStore descriptor to tensor & model keys

[ankona]

• Enables using multiple feature stores by enhancing the existing tensor/model-key classes to include the feature store descriptor.
• Update the EnvironmentConfigLoader to retrieve multiple feature stores from environment using the prior key as a prefix to query with
• Minor (lift & shift) refactor of top-level functions in worker manager module to reduce number of touch-points for converting to FeatureStoreKey from capnproto type
  • now, only worker.py deals with this conversion.

[codecov]

Codecov Report

Attention: Patch coverage is 27.11864% with 86 lines in your changes missing coverage. Please review.

Please upload report for BASE (mli-feature@263e3c7). Learn more about missing BASE report.

Files	Patch %	Lines
smartsim/_core/mli/infrastructure/worker/worker.py	37.03%	34 Missing ⚠️
...tsim/_core/mli/infrastructure/environmentloader.py	0.00%	33 Missing ⚠️
...e/mli/infrastructure/storage/dragonfeaturestore.py	0.00%	19 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             mli-feature     #633   +/-   ##
==============================================
  Coverage               ?   65.21%           
==============================================
  Files                  ?       97           
  Lines                  ?     6840           
  Branches               ?        0           
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  Hits                   ?     4461           
  Misses                 ?     2379           
  Partials               ?        0           

Files	Coverage Δ
smartsim/_core/launcher/dragon/dragonBackend.py	35.54% <ø> (ø)
smartsim/_core/mli/comm/channel/channel.py	66.66% <ø> (ø)
...m/_core/mli/infrastructure/storage/featurestore.py	100.00% <100.00%> (ø)
smartsim/_core/mli/message_handler.py	75.59% <100.00%> (ø)
...e/mli/infrastructure/storage/dragonfeaturestore.py	0.00% <0.00%> (ø)
...tsim/_core/mli/infrastructure/environmentloader.py	0.00% <0.00%> (ø)
smartsim/_core/mli/infrastructure/worker/worker.py	59.83% <37.03%> (ø)

[AlyssaCote]

Loving these changes!! Really my only request is that we update files pertaining to the mli_driver so that we can run it without it crashing and burning.

[mellis13]

Just a couple of initial comments/questions

[al-rigazzi]

Per our recent conversation, I am sorry you had to tie up so many loose ends created by the hacky solutions. I'll review the PR again once previous comments are addressed.

[AlyssaCote]

Love the changes! Just a few small cleanup comments.