Add initial schema generation for team-broker topics

[knolleary]

Part of #4919

Description

Initial implementation of schema generation based on the observed team broker topics.

See #4919 for details on the schema and url used to expose.

[hardillb]

Approved, but with one comment

[codecov]

Codecov Report

Attention: Patch coverage is 27.77778% with 13 lines in your changes missing coverage. Please review.

Project coverage is 78.36%. Comparing base (c0e2da7) to head (988e31c).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/ee/routes/teamBroker/schema.js	18.75%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4997      +/-   ##
==========================================
- Coverage   78.42%   78.36%   -0.06%     
==========================================
  Files         325      326       +1     
  Lines       15359    15377      +18     
  Branches     3530     3534       +4     
==========================================
+ Hits        12045    12050       +5     
- Misses       3314     3327      +13     

Flag	Coverage Δ
backend	78.36% <27.77%> (-0.06%)	⬇️

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