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/integration_test/scim_test.go

@@ -0,0 +1,28 @@
+//go:build integration
+
+package integration_test
+
+import (
+	"context"
+	"github.com/zitadel/zitadel/internal/integration"
+	"os"
+	"testing"
+	"time"
+)
+
+var (
+	Instance *integration.Instance
+	CTX      context.Context
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(func() int {
+		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Minute)
+		defer cancel()
+
+		Instance = integration.NewInstance(ctx)
+
+		CTX = Instance.WithAuthorization(ctx, integration.UserTypeOrgOwner)
+		return m.Run()
+	}())
+}