Factories refactor (#1843)

* factories refactor doc

* Adds file schema and filesystem organization

* Update 20231106-factories.md

* move factories out of blueprints and create new factories  README

* align factory in billing-account module

* align factory in dataplex-datascan module

* align factory in billing-account module

* align factory in net-firewall-policy module

* align factory in dns-response-policy module

* align factory in net-vpc-firewall module

* align factory in net-vpc module

* align factory variable names in FAST

* remove decentralized firewall blueprint

* bump terraform version

* bump module versions

* update top-level READMEs

* move project factory to modules

* fix variable names and tests

* tfdoc

* remove changelog link

* add project factory to top-level README

* fix cludrun eventarc diff

* fix README

* fix cludrun eventarc diff

---------

Co-authored-by: Simone Ruffilli <sruffilli@google.com>

modules/__experimental_deprecated/alloydb-instance/versions.tf

@@ -0,0 +1,27 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+terraform {
+  required_version = ">= 1.7.4"
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = ">= 5.12.0, < 6.0.0" # tftest
+    }
+    google-beta = {
+      source  = "hashicorp/google-beta"
+      version = ">= 5.12.0, < 6.0.0" # tftest
+    }
+  }
+}