feat(core): Introduce ERS mode, ability to connect to remote ERS #6721

Job	Run time
Protocol Buffer Lint and Gencode Up-to-date check	24s
go (examples)	46s
image build	1m 43s
go (sdk)	1m 41s
integration tests	4m 26s
go (service)	2m 56s
go (lib/ocrypto)	1m 2s
license check	54s
otdfctl e2e tests	4m 58s
go (lib/fixtures)	48s
go (lib/flattening)	44s
platform-xtest / cross-client-test	9m 1s
ci	1s
	29m 24s

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