feat(sdk)!: switch to `connect-rpc` for GRPC #937

Job	Run time
mavenverify	1m 24s
platform-integration	3m 14s
Validate PR title	3s
SonarCloud Scan	2m 2s
platform-xtest / resolve-versions	9s
platform-xtest / cross-client-test (main)	12m 49s
platform-xtest / cross-client-test (v0.4.26)	13s
ci	1s
	19m 55s

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