feat(sdk)!: switch to `connect-rpc` for GRPC #990

Job	Run time
mavenverify	1m 20s
SonarCloud Scan	1m 40s
Validate PR title	8s
platform-integration	2m 51s
platform-xtest / resolve-versions	10s
platform-xtest / cross-client-test (main)	21m 11s
platform-xtest / cross-client-test (v0.4.26)	13m 7s
ci	1s
	40m 28s

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