Add support for Solr group queries to Solr service

[ptgolden]

This adds a new method for the Solr service, .group_query(), which allows running Solr queries which group returned documents.

https://solr.apache.org/guide/6_6/result-grouping.html

This only implements the group.query option, not group.field or group.func.

Related issues

• Necessary for Add experimental edge-merged association table endpoint #430 and Make histopheno bars clickable to filter association table #440

Checks

• All tests have passed (or issues created for failing tests)

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[ptgolden]

(Also related to #821 and possibly #841)

[ptgolden]

It's possible that grouped_query might be a better name for the method-- what do you think @kevinschaper?

[codecov]

Codecov Report

Attention: Patch coverage is 61.29032% with 12 lines in your changes missing coverage. Please review.

Project coverage is 71.06%. Comparing base (af5ab7b) to head (b87a51b).

Files with missing lines	Patch %	Lines
backend/src/monarch_py/service/solr_service.py	14.28%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #914      +/-   ##
==========================================
- Coverage   71.14%   71.06%   -0.08%     
==========================================
  Files          91       91              
  Lines        3136     3166      +30     
==========================================
+ Hits         2231     2250      +19     
- Misses        905      916      +11     

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