feat(http_config): support JWT token auth as alternative to client secret (RFC 7523 3.1) #781
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This PR implements JWT Authentication for Authorization Grant (RFC 7523 3.1) as alternative to static client credentials.
As I know, this auth flow is used by STACKIT Service Accounts (Key Flow).
I tried to not break any exists method signatures to remain backwards compatibility.
Note: This PR does not provide support for JWTs in Client Authentication Processing, since it not supported by x/oauth2 yet. See golang/oauth2#745
As I know, JWTs in Client Authentication Processing is used by Microsoft Entra ID (Client Certificates).