feat(sdk)!: switch to `connect-rpc` for GRPC #988

Job	Run time
SonarCloud Scan	1m 45s
mavenverify	1m 28s
Validate PR title	2s
platform-integration	2m 37s
platform-xtest / resolve-versions	10s
platform-xtest / cross-client-test (main)	20m 19s
platform-xtest / cross-client-test (v0.4.26)	14m 7s
ci	1s
	40m 29s

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