feat(core): Expose context authn methods (#1812) #6925

Job	Run time
image build	1m 43s
integration tests	4m 36s
benchmark tests	4m 42s
Protocol Buffer Lint and Gencode Up-to-date check	14s
go (examples)	54s
license check	55s
go (sdk)	1m 47s
go (service)	3m 12s
otdfctl e2e tests	4m 40s
go (lib/ocrypto)	40s
go (lib/fixtures)	38s
go (lib/flattening)	44s
platform-xtest / cross-client-test	9m 20s
ci	1s
	34m 6s

Provide feedback