feat(scf): Add STACKIT Cloud Foundry (#991)

* onboard STACKIT Cloud Foundry resources/datasource

docs/data-sources/scf_organization.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_scf_organization Data Source - stackit"
+subcategory: ""
+description: |-
+  STACKIT Cloud Foundry organization datasource schema. Must have a region specified in the provider configuration.
+---
+
+# stackit_scf_organization (Data Source)
+
+STACKIT Cloud Foundry organization datasource schema. Must have a `region` specified in the provider configuration.
+
+## Example Usage
+
+```terraform
+data "stackit_scf_organization" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  org_id     = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `org_id` (String) The ID of the Cloud Foundry Organization
+- `project_id` (String) The ID of the project associated with the organization
+
+### Optional
+
+- `region` (String) The resource region. If not defined, the provider region is used
+
+### Read-Only
+
+- `created_at` (String) The time when the organization was created
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`region`,`org_id`".
+- `name` (String) The name of the organization
+- `platform_id` (String) The ID of the platform associated with the organization
+- `quota_id` (String) The ID of the quota associated with the organization
+- `status` (String) The status of the organization (e.g., deleting, delete_failed)
+- `suspended` (Boolean) A boolean indicating whether the organization is suspended
+- `updated_at` (String) The time when the organization was last updated

docs/data-sources/scf_organization_manager.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_scf_organization_manager Data Source - stackit"
+subcategory: ""
+description: |-
+  STACKIT Cloud Foundry organization manager datasource schema.
+---
+
+# stackit_scf_organization_manager (Data Source)
+
+STACKIT Cloud Foundry organization manager datasource schema.
+
+## Example Usage
+
+```terraform
+data "stackit_scf_organization_manager" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  org_id     = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `org_id` (String) The ID of the Cloud Foundry Organization
+- `project_id` (String) The ID of the project associated with the organization of the organization manager
+
+### Optional
+
+- `region` (String) The region where the organization of the organization manager is located. If not defined, the provider region is used
+
+### Read-Only
+
+- `created_at` (String) The time when the organization manager was created
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`region`,`org_id`,`user_id`".
+- `platform_id` (String) The ID of the platform associated with the organization of the organization manager
+- `updated_at` (String) The time when the organization manager was last updated
+- `user_id` (String) The ID of the organization manager user
+- `username` (String) An auto-generated organization manager user name

docs/data-sources/scf_platform.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_scf_platform Data Source - stackit"
+subcategory: ""
+description: |-
+  STACKIT Cloud Foundry Platform datasource schema.
+---
+
+# stackit_scf_platform (Data Source)
+
+STACKIT Cloud Foundry Platform datasource schema.
+
+## Example Usage
+
+```terraform
+data "stackit_scf_platform" "example" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  platform_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `platform_id` (String) The unique id of the platform
+- `project_id` (String) The ID of the project associated with the platform
+
+### Optional
+
+- `region` (String) The region where the platform is located. If not defined, the provider region is used
+
+### Read-Only
+
+- `api_url` (String) The CF API Url of the platform
+- `console_url` (String) The Stratos URL of the platform
+- `display_name` (String) The name of the platform
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`region`,`platform_id`".
+- `system_id` (String) The ID of the platform System