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/zerrors/zerror_test.go

@@ -1,6 +1,7 @@
 package zerrors_test
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -17,3 +18,27 @@ func TestErrorMethod(t *testing.T) {
 	subExptected := "ID=subID Message=subMsg Parent=(ID=id Message=msg)"
 	assert.Equal(t, subExptected, err.Error())
 }
+
+func TestIsZitadelError(t *testing.T) {
+	tests := []struct {
+		name string
+		err  error
+		want bool
+	}{
+		{
+			name: "zitadel error",
+			err:  zerrors.ThrowInvalidArgument(nil, "id", "msg"),
+			want: true,
+		},
+		{
+			name: "other error",
+			err:  errors.New("just a random error"),
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equalf(t, tt.want, zerrors.IsZitadelError(tt.err), "IsZitadelError(%v)", tt.err)
+		})
+	}
+}