feat(core): Introduce ERS mode, ability to connect to remote ERS #6732

Job	Run time
Protocol Buffer Lint and Gencode Up-to-date check	46s
go (examples)	1m 5s
image build	1m 46s
go (sdk)	1m 49s
go (service)	3m 32s
integration tests	6m 57s
license check	1m 13s
go (lib/ocrypto)	1m 8s
go (lib/fixtures)	1m 14s
otdfctl e2e tests	6m 23s
go (lib/flattening)	1m 8s
platform-xtest / cross-client-test	8m 46s
ci	1s
	35m 48s

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