feat(sdk)!: switch to `connect-rpc` for GRPC #958

Job	Run time
Validate PR title	4s
platform-integration	2m 52s
mavenverify	1m 18s
SonarCloud Scan	2m 7s
platform-xtest / resolve-versions	14s
platform-xtest / cross-client-test (main)	14m 21s
platform-xtest / cross-client-test (v0.4.26)	12m 26s
ci	3s
	33m 25s

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