feat(sdk)!: switch to `connect-rpc` for GRPC #959

Job	Run time
platform-integration	3m 4s
Validate PR title	2s
mavenverify	1m 37s
SonarCloud Scan	2m 16s
platform-xtest / resolve-versions	14s
platform-xtest / cross-client-test (main)	22m 0s
platform-xtest / cross-client-test (v0.4.26)	12m 39s
ci	1s
	41m 53s

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