sso integrations (#822)

* stub out hybrid sso

* support for PKCE authorization_code clients

* sso service urls

* sso client key

* abstract request validator

* support for verifying password

* custom AuthorizationCodeStore that does not remove codes

* cleanup

* comment

* created master password

* ResetMasterPassword

* rename Sso client to OidcIdentity

* update env builder

* bitwarden sso project in docker-compose

* sso path in nginx config

src/Identity/Models/RedirectViewModel.cs

@@ -0,0 +1,7 @@
+namespace Bit.Identity.Models
+{
+    public class RedirectViewModel
+    {
+        public string RedirectUrl { get; set; }
+    }
+}