feat: enable grpc server reflection

[muhlemmer]

This change enables gRPC server reflection. It allows for easier setting up of dev-tools like gRPCurl and gRPCui.

To see it in action, after you start zitadel on the localhost:

go install github.com/fullstorydev/grpcui/cmd/grpcui@latest
grpcui -plaintext localhost:8080

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 8:58am

[codecov]

Codecov Report

Merging #5689 (383e68b) into main (2962870) will increase coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #5689      +/-   ##
==========================================
+ Coverage   44.64%   44.66%   +0.01%     
==========================================
  Files        1186     1187       +1     
  Lines      104515   104527      +12     
==========================================
+ Hits        46665    46682      +17     
+ Misses      55676    55672       -4     
+ Partials     2174     2173       -1     

Impacted Files	Coverage Δ
internal/api/grpc/probes.go	72.72% <72.72%> (ø)
internal/api/api.go	68.00% <100.00%> (+0.21%)	⬆️

... and 4 files with indirect coverage changes

[github-actions]

🎉 This PR is included in version 2.24.0-ignore-me2.1 🎉

The release is available on GitHub release

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