feat(sdk)!: switch to `connect-rpc` for GRPC #957

Job	Run time
mavenverify	1m 24s
platform-integration	4m 41s
Validate PR title	4s
SonarCloud Scan	2m 2s
platform-xtest / resolve-versions	7s
platform-xtest / cross-client-test (main)	14m 31s
platform-xtest / cross-client-test (v0.4.26)	12m 21s
ci	1s
	35m 11s

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