Validate access token by using auth_jwt directives for 7 IdPs

[shawnhankim]

AC:

• Validate access token by using auth_jwt directives before sending it to proxy server
• Test w/ the following identity providers (IdPs):
  • Amazon Cognito
  • Auth0
  • Azure AD
  • Keycloak
  • Okta
  • OneLogin
  • Ping Identity