feat(run): generate library

[dbolduc]

Fixes #9446

The changes to cmake/CompileProtos.cmake were required because Cloud Run has a k8s.min.proto. Previously, we would parse the basename as: k8s not k8s.min.

Also, we use a custom endpoint name so it doesn't conflict with

google-cloud-cpp/google/cloud/appengine/doc/main.dox

Lines 67 to 69 in 4be7b7e

	- `GOOGLE_CLOUD_CPP_SERVICES_ENDPOINT=...` overrides the
	`EndpointOption` (which defaults to "appengine.googleapis.com")
	used by `MakeServicesConnection()`.

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This change is 

[google-cloud-cpp-bot]

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For commit: 6f96b5d338f70edee13db41b79fb657c9183bd14

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[codecov]

Codecov Report

Merging #9460 (6f96b5d) into main (ead714b) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #9460      +/-   ##
==========================================
- Coverage   94.63%   94.63%   -0.01%     
==========================================
  Files        1486     1486              
  Lines      136696   136696              
==========================================
- Hits       129369   129364       -5     
- Misses       7327     7332       +5     

Impacted Files	Coverage Δ
...loud/bigtable/internal/connection_refresh_state.cc	97.22% <0.00%> (-2.78%)	⬇️
...cloud/pubsub/internal/subscription_session_test.cc	97.98% <0.00%> (-0.68%)	⬇️
google/cloud/internal/curl_impl.cc	91.87% <0.00%> (+0.22%)	⬆️

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[coryan]

Linking the functions framework from the README is a great idea