* Set and verify a nonce with OIDC
* Create a CSRF object to manage nonces & cookies
* Add missing generic cookie unit tests
* Add config flag to control OIDC SkipNonce
* Send hashed nonces in authentication requests
* Encrypt the CSRF cookie
* Add clarity to naming & add more helper methods
* Make CSRF an interface and keep underlying nonces private
* Add ReverseProxy scope to cookie tests
* Align to new 1.16 SameSite cookie default
* Perform SecretBytes conversion on CSRF cookie crypto
* Make state encoding signatures consistent
* Mock time in CSRF struct via Clock
* Improve InsecureSkipNonce docstring
When using the configured provider JWT Verifier, it makes
sense to use the provider `CreateSessionStateFromBearerToken`
method. For any extra JWT Issuers, they should use a generic
default verifier.
* New SessionState to consolidate email, access token and refresh token
* split ServeHttp into individual methods
* log on session renewal
* log on access token refresh
* refactor cookie encription/decription and session state serialization