feat: create user scim v2 endpoint (#9132)

# Which Problems Are Solved
- Adds infrastructure code (basic implementation, error handling,
middlewares, ...) to implement the SCIM v2 interface
- Adds support for the user create SCIM v2 endpoint

# How the Problems Are Solved
- Adds support for the user create SCIM v2 endpoint under `POST
/scim/v2/{orgID}/Users`

# Additional Context

Part of #8140

cmd/start/start.go

@@ -63,6 +63,8 @@ import (
 	"github.com/zitadel/zitadel/internal/api/oidc"
 	"github.com/zitadel/zitadel/internal/api/robots_txt"
 	"github.com/zitadel/zitadel/internal/api/saml"
+	"github.com/zitadel/zitadel/internal/api/scim"
+	"github.com/zitadel/zitadel/internal/api/scim/schemas"
 	"github.com/zitadel/zitadel/internal/api/ui/console"
 	"github.com/zitadel/zitadel/internal/api/ui/console/path"
 	"github.com/zitadel/zitadel/internal/api/ui/login"
@@ -519,6 +521,17 @@ func startAPIs(
 	}
 	apis.RegisterHandlerOnPrefix(saml.HandlerPrefix, samlProvider.HttpHandler())
 
+	apis.RegisterHandlerOnPrefix(
+		schemas.HandlerPrefix,
+		scim.NewServer(
+			commands,
+			queries,
+			verifier,
+			keys.User,
+			&config.SCIM,
+			instanceInterceptor.HandlerFuncWithError,
+			middleware.AuthorizationInterceptor(verifier, config.InternalAuthZ).HandlerFuncWithError))
+
 	c, err := console.Start(config.Console, config.ExternalSecure, oidcServer.IssuerFromRequest, middleware.CallDurationHandler, instanceInterceptor.Handler, limitingAccessInterceptor, config.CustomerPortal)
 	if err != nil {
 		return nil, fmt.Errorf("unable to start console: %w", err)