AuthN: Post login hooks (#61287)

* AuthN: add the ability to register post login hooks

* AuthN: add a guard for the user id

* AuthN: Add helper to create external user info from identity

* AuthN: Pass auth request to password clients

* AuthN: set auth module and username in metadata

pkg/services/authn/clients/basic.go

@@ -34,6 +34,8 @@ func (c *Basic) Authenticate(ctx context.Context, r *authn.Request) (*authn.Iden
 		return nil, errDecodingBasicAuthHeader.Errorf("failed to decode basic auth header: %w", err)
 	}
 
+	r.SetMeta(authn.MetaKeyUsername, username)
+
 	ok, err := c.loginAttempts.Validate(ctx, username)
 	if err != nil {
 		return nil, err
@@ -47,7 +49,7 @@ func (c *Basic) Authenticate(ctx context.Context, r *authn.Request) (*authn.Iden
 	}
 
 	for _, pwClient := range c.clients {
-		identity, err := pwClient.AuthenticatePassword(ctx, r.OrgID, username, password)
+		identity, err := pwClient.AuthenticatePassword(ctx, r, username, password)
 		if err != nil {
 			if errors.Is(err, errIdentityNotFound) {
 				// continue to next password client if identity could not be found