feat: add metadata filtering to SearchRuns

[AmanuelAaron]

Ticket

ET-50

Description

Add the ability to filter base off of arbitrary metadata in SearchRuns endpoint. This should work similarly to how hyperparameters are filtered currently.

Test Plan

Written tests should pass.

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

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[codecov]

Codecov Report

Attention: Patch coverage is 58.75000% with 33 lines in your changes missing coverage. Please review.

Project coverage is 52.89%. Comparing base (0a57cde) to head (d99b257).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9611      +/-   ##
==========================================
- Coverage   52.91%   52.89%   -0.03%     
==========================================
  Files        1255     1255              
  Lines      153086   153166      +80     
  Branches     3230     3229       -1     
==========================================
+ Hits        81004    81010       +6     
- Misses      71931    72005      +74     
  Partials      151      151              

Flag	Coverage Δ
backend	44.02% <58.22%> (-0.06%)	⬇️
harness	72.76% <ø> (ø)
web	51.30% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
webui/react/src/ioTypes.ts	90.90% <100.00%> (+0.02%)	⬆️
master/internal/experiment_filter.go	86.53% <58.22%> (-5.25%)	⬇️

... and 8 files with indirect coverage changes

[jesse-amano-hpe]

LGTM

[johnkim-det]

nit/question: does the location need to be named RUN_METADATA instead of just METADATA? Looks like we specify for HYPERPARAMETERS/RUN_HYPERPARAMETERS but not for VALIDATIONS, TRAINING, or CUSTOM_METRIC. FWIW it looks like we said METADATA was fine in grooming.

either way, LocationType changes in web LGTM