feat(sdk)!: switch to `connect-rpc` for GRPC #954

Job	Run time
SonarCloud Scan	2m 5s
mavenverify	1m 19s
Validate PR title	3s
platform-integration	3m 10s
platform-xtest / resolve-versions	13s
platform-xtest / cross-client-test (main)	13m 57s
platform-xtest / cross-client-test (v0.4.26)	12m 34s
ci	1s
	33m 22s

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