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_instance.md

@@ -44,7 +44,7 @@ import {
 
 - `backup_schedule` (String)
 - `encryption` (Attributes) The encryption block. (see [below for nested schema](#nestedatt--encryption))
-- `flavor` (Attributes) The block that defines the flavor data. (see [below for nested schema](#nestedatt--flavor))
+- `flavor_id` (String)
 - `name` (String) Instance name.
 - `network` (Attributes) The network block configuration. (see [below for nested schema](#nestedatt--network))
 - `project_id` (String) STACKIT project ID to which the instance is associated.
@@ -73,24 +73,6 @@ Required:
 - `service_account` (String) The service account ID of the service account.
 
 
-<a id="nestedatt--flavor"></a>
-### Nested Schema for `flavor`
-
-Required:
-
-- `cpu` (Number) The CPU count of the flavor.
-- `ram` (Number) The RAM count of the flavor.
-
-Optional:
-
-- `id` (String) The ID of the flavor.
-- `node_type` (String) The node type of the flavor. (Single or Replicas)
-
-Read-Only:
-
-- `description` (String) The flavor detailed flavor name.
-
-
 <a id="nestedatt--network"></a>
 ### Nested Schema for `network`