providers/oauth2: Add provider federation between OAuth2 Providers #26087

Job	Run time
lint-golint	1m 1s
test-unittest	3m 20s
ci-outpost-mark	1s
build-container (proxy)	2m 54s
build-binary (proxy, linux, amd64)	1m 47s
build-container (ldap)	2m 27s
build-binary (proxy, linux, arm64)	1m 57s
build-container (radius)	2m 24s
build-binary (ldap, linux, amd64)	1m 41s
build-binary (ldap, linux, arm64)	2m 2s
build-container (rac)	2m 50s
build-binary (radius, linux, amd64)	1m 38s
build-binary (radius, linux, arm64)	1m 59s
build-binary (rac, linux, amd64)	1m 39s
build-binary (rac, linux, arm64)	2m 4s
	29m 44s

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