feat(custom-views): add custom views get endpoint

[MichaelSun48]

This endpoint creates the GET organizations/<org_id_or_slug>/group-search-views/ Endpoint along with some tests. This endpoint will be responsible for fetching a user's custom views within an organization.

⚠️ This PR is dependent on #71731 being merged run in production, and this branch will need to be rebased upon that happening

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.07%. Comparing base (8d255a2) to head (94d7a72).
Report is 61 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #71942      +/-   ##
==========================================
+ Coverage   78.05%   78.07%   +0.01%     
==========================================
  Files        6597     6599       +2     
  Lines      294016   294117     +101     
  Branches    50716    50728      +12     
==========================================
+ Hits       229508   229620     +112     
+ Misses      58246    58233      -13     
- Partials     6262     6264       +2     

Files	Coverage Δ
...c/sentry/api/serializers/models/groupsearchview.py	100.00% <100.00%> (ø)
src/sentry/api/urls.py	100.00% <ø> (ø)
src/sentry/issues/endpoints/__init__.py	100.00% <100.00%> (ø)
src/sentry/models/savedsearch.py	100.00% <100.00%> (ø)
...ssues/endpoints/organization_group_search_views.py	93.10% <93.10%> (ø)

... and 52 files with indirect coverage changes

[malwilley]

Can this not be typed as SortOptions?

[MichaelSun48]

I tried for like an hour to get this to work before just giving up. For some reason, mypy refuses to enforce the type if I set it to SortOptions - I setquerySort of a view instance to "awioef" and mypy thought it was fine.