feat: unified APIs with REST, gRPC and Connect RPC #2215

Job	Run time
Run race tests	2m 22s
Run tests	4m 1s
Run buf actions	1m 38s
Run lints and checks	3m 6s
Build CLI docs	1m 6s
Generate SDKs	3m 57s
Generate changelog	0s
Generate release	0s
Render version schema	0s
Draft newsletter	0s
Pending approval Slack notification	0s
Send newsletter	0s
Release SDKs	0s
	16m 10s

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