Adds route to fetch facility hubs

[shivankacker]

Proposed Changes

• Adds a route to fetch all hubs for a facility

BE PR for ohcnetwork/care_fe#8729

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@ohcnetwork/care-backend-maintainers @ohcnetwork/care-backend-admins

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.62%. Comparing base (08f0c72) to head (aeb02d8).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2520      +/-   ##
===========================================
+ Coverage    65.59%   65.62%   +0.02%     
===========================================
  Files          223      223              
  Lines        13383    13393      +10     
  Branches      1855     1855              
===========================================
+ Hits          8779     8789      +10     
  Misses        4218     4218              
  Partials       386      386              

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