feat(cloudsql): Add postgres samples for enterprise & enterprise_plus edition

cloud_sql/postgres_enterprise_edition_instance/main.tf

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+/**
+ * Copyright 2022 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
+ *
+ *      http://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.
+ */
+
+
+# [START cloud_sql_enterprise_instance]
+resource "google_sql_database_instance" "default" {
+  name             = "enterprise-instance"
+  region           = "us-central1"
+  database_version = "POSTGRES_15"
+  settings {
+    tier = "db-g1-small"
+  }
+  deletion_protection = "false"
+}
+# [END cloud_sql_enterprise_instance]

cloud_sql/postgres_enterprise_plus_edition_instance/main.tf

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+/**
+ * Copyright 2022 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
+ *
+ *      http://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.
+ */
+
+# [START cloud_sql_enterprise_plus_instance]
+resource "google_sql_database_instance" "default" {
+  name             = "enterprise_plus_instance"
+  region           = "us-central1"
+  database_version = "POSTGRES_15"
+  settings {
+    tier    = "db-perf-optimized-N-96"
+    edition = "ENTERPRISE_PLUS"
+  }
+  deletion_protection = false
+}
+# [END cloud_sql_enterprise_plus_instance]