feat(cdn): add geoblocking (#906)

relates to STACKITCDN-841

docs/data-sources/cdn_distribution.md

@@ -43,6 +43,10 @@ data "stackit_cdn_distribution" "example" {
 <a id="nestedatt--config"></a>
 ### Nested Schema for `config`
 
+Optional:
+
+- `blocked_countries` (List of String) The configured countries where distribution of content is blocked
+
 Read-Only:
 
 - `backend` (Attributes) The configured backend for the distribution (see [below for nested schema](#nestedatt--config--backend))

docs/guides/stackit_cdn_with_custom_domain.md

@@ -21,7 +21,8 @@ This guide outlines the process of creating a STACKIT CDN distribution and confi
           type       = "http"
           origin_url = "mybackend.onstackit.cloud"
         }
-        regions = ["EU", "US", "ASIA", "AF", "SA"]
+        regions           = ["EU", "US", "ASIA", "AF", "SA"]
+        blocked_countries = ["DE", "AT", "CH"]
       }
     }
     

docs/resources/cdn_distribution.md

@@ -23,7 +23,9 @@ resource "stackit_cdn_distribution" "example_distribution" {
       type       = "http"
       origin_url = "mybackend.onstackit.cloud"
     }
-    regions = ["EU", "US", "ASIA", "AF", "SA"]
+    regions           = ["EU", "US", "ASIA", "AF", "SA"]
+    blocked_countries = ["DE", "AT", "CH"]
+
     optimizer = {
       enabled = true
     }
@@ -59,6 +61,7 @@ Required:
 
 Optional:
 
+- `blocked_countries` (List of String) The configured countries where distribution of content is blocked
 - `optimizer` (Attributes) Configuration for the Image Optimizer. This is a paid feature that automatically optimizes images to reduce their file size for faster delivery, leading to improved website performance and a better user experience. (see [below for nested schema](#nestedatt--config--optimizer))
 
 <a id="nestedatt--config--backend"></a>