Feat/separate functions (#19)

* chore: work save

* fix: refactor flavors

* fix: refactor pg user and database

* fix: refactor flavor parameters

* fix: refactor tf script

* chore: work save

* chore: work save

* chore: work save

---------

Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

docs/resources/postgresflexalpha_database.md

@@ -0,0 +1,47 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackitprivatepreview_postgresflexalpha_database Resource - stackitprivatepreview"
+subcategory: ""
+description: |-
+  Postgres Flex database resource schema. Must have a region specified in the provider configuration.
+---
+
+# stackitprivatepreview_postgresflexalpha_database (Resource)
+
+Postgres Flex database resource schema. Must have a `region` specified in the provider configuration.
+
+## Example Usage
+
+```terraform
+resource "stackitprivatepreview_postgresflexalpha_database" "example" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  instance_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name        = "mydb"
+  owner       = "myusername"
+}
+
+# Only use the import statement, if you want to import an existing postgresflex database
+import {
+  to = stackitprivatepreview_postgresflexalpha_database.import-example
+  id = "${var.project_id},${var.region},${var.postgres_instance_id},${var.postgres_database_id}"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `instance_id` (String) ID of the Postgres Flex instance.
+- `name` (String) Database name.
+- `owner` (String) Username of the database owner.
+- `project_id` (String) STACKIT project ID to which the instance is associated.
+
+### Optional
+
+- `region` (String) The resource region. If not defined, the provider region is used.
+
+### Read-Only
+
+- `database_id` (Number) Database ID.
+- `id` (String) Terraform's internal resource ID. It is structured as "`project_id`,`region`,`instance_id`,`database_id`".