feat(sdk)!: switch to `connect-rpc` for GRPC #944

Job	Run time
SonarCloud Scan	2m 8s
mavenverify	1m 27s
Validate PR title	3s
platform-integration	4m 24s
platform-xtest / resolve-versions	10s
platform-xtest / cross-client-test (main)	14m 22s
platform-xtest / cross-client-test (v0.4.26)	12m 50s
ci	1s
	35m 25s

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