fix: output protobufAny definition using correct JSON schema

[dan-j]

References to other Issues or PRs

Fixes #2177

Have you read the Contributing Guidelines?

Yes

Brief description of what is fixed or changed

Output the correct JSON schema for google.protobuf.Any as specified by the any.proto documentation.

Other comments

Originally created PR #2180 but this wasn't the best approach. I've closed that and opened this since it made reviewing on top of out-of-date comments difficult.

I've made three separate commits which may make reviewing easier. I've added tests as the first commit which reproduces the issue.

[dan-j]

Just to help the reviewer, the only files I've changed is template.go and template_test.go. The rest of the changes are generated by make generate and bazel

[johanbrandhorst]

This is a great change, thank you for your thorough testing and your patience!

[google-cla]

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[johanbrandhorst]

@googlebot I consent.

[johanbrandhorst]

Just made a quick fix to the formatting of the test file :)

[codecov-commenter]

Codecov Report

Merging #2292 (31518db) into master (64a5e7e) will increase coverage by 0.47%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master    #2292      +/-   ##
==========================================
+ Coverage   59.16%   59.64%   +0.47%     
==========================================
  Files          35       35              
  Lines        4484     4500      +16     
==========================================
+ Hits         2653     2684      +31     
+ Misses       1544     1525      -19     
- Partials      287      291       +4     

Impacted Files	Coverage Δ
...otoc-gen-openapiv2/internal/genopenapi/template.go	63.77% <81.25%> (+0.67%)	⬆️
protoc-gen-openapiv2/internal/genopenapi/types.go	65.21% <0.00%> (+47.82%)	⬆️

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[johanbrandhorst]

Thanks for your contribution!