Use buf to generate stubs

[eapolinario]

Tracking issue

NA

Why are the changes needed?

What changes were proposed in this pull request?

Use buf to produce proto stubs, including stubs for typescript and buf connect.

We're not going to generate java and cpp anymore.

We'll have to figure out a way to serve the generated swagger.json file in admin (in a separate PR).

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bfe61f9) 58.97% compared to head (822d0b3) 58.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4806   +/-   ##
=======================================
  Coverage   58.97%   58.98%           
=======================================
  Files         644      645    +1     
  Lines       55146    55148    +2     
=======================================
+ Hits        32525    32529    +4     
+ Misses      20048    20045    -3     
- Partials     2573     2574    +1     

Flag	Coverage Δ
unittests	58.98% <100.00%> (+<0.01%)	⬆️

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