feat(core): Move keycloak ers to separate module #5718

Job	Run time
go (examples)	1m 27s
go (sdk)	1m 26s
go (service)	1m 26s
go (lib/ocrypto)	52s
go (lib/fixtures)	50s
go (lib/flattening)	1m 24s
Protocol Buffer Lint and Gencode Up-to-date check	25s
go (keycloak-entity-resolution)	1m 23s
image build	2m 20s
integration tests	4m 31s
otdfctl e2e tests	4m 3s
license check	56s
platform-xtest / cross-client-test	7m 39s
ci	1s
	28m 43s

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