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

internal/api/scim/authz.go

@@ -0,0 +1,13 @@
+package scim
+
+import (
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/api/http"
+	"github.com/zitadel/zitadel/internal/domain"
+)
+
+var AuthMapping = authz.MethodMapping{
+	"POST:/scim/v2/" + http.OrgIdInPathVariable + "/Users": {
+		Permission: domain.PermissionUserWrite,
+	},
+}