feat(sdk)!: switch to `connect-rpc` for GRPC #961

Job	Run time
Validate PR title	6s
SonarCloud Scan	1m 50s
platform-integration	3m 9s
mavenverify	1m 21s
platform-xtest / resolve-versions	17s
platform-xtest / cross-client-test (main)	20m 9s
platform-xtest / cross-client-test (v0.4.26)	12m 55s
ci	1s
	39m 48s

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