Add OIDC middleware

[mantas-sidlauskas]

Adding OpenID Connect (OIDC) middleware.

• The OIDC middleware allows users to authenticate using external identity providers (IdPs) providers. (Okta, AWS Cognito, Auth0, Google, etc)
• Configuration can be passed as env variables or using dedicated configuration file.
• Middleware will check for token exp time to avoid situation when expired token is sent to Cadence Server

[Assem-Uber]

Thanks for working on it @mantas-sidlauskas, i'm out for 2 weeks and will take a look once back.

[mantas-sidlauskas]

Thanks for working on it @mantas-sidlauskas, i'm out for 2 weeks and will take a look once back.

sure, thanks!