feat(sdk)!: switch to `connect-rpc` for GRPC #992

Job	Run time
mavenverify	1m 31s
Validate PR title	2s
SonarCloud Scan	2m 4s
platform-integration	4m 3s
platform-xtest / resolve-versions	8s
platform-xtest / cross-client-test (main)	20m 22s
platform-xtest / cross-client-test (v0.4.26)	12m 53s
ci	1s
	41m 4s

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