feat: DIA-1725: add model-metadata endpoint

[pakelley]

Add endpoint for getting metadata of a set of models

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 67.63%. Comparing base (2fa3215) to head (1ae607d).

Files with missing lines	Patch %	Lines
adala/runtimes/_litellm.py	8.33%	11 Missing ⚠️
server/app.py	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
- Coverage   67.86%   67.63%   -0.24%     
==========================================
  Files          47       47              
  Lines        2524     2549      +25     
==========================================
+ Hits         1713     1724      +11     
- Misses        811      825      +14     

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[matt-bernstein]

/git merge master

Workflow run
Successfully merged: 5 files changed, 55 insertions(+), 38 deletions(-)