feat: add uxi_network_group_assignment examples and generated docs

examples/data-sources/uxi_network_group_assignment/data-source.tf

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+# Retrieve data for a network group assignment
+data "uxi_network_group_assignment" "my_network_group_assignment" {
+  filter = {
+    id = "<my_network_group_assignment_id>"
+  }
+}

examples/resources/uxi_network_group_assignment/import.sh

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+# Import network group assignment using its ID
+terraform import uxi_network_group_assignment.my_network_group_assignment <my_network_group_assignment_id>
+
+# Import network group assignment using its ID with an import block
+import {
+    to = uxi_network_group_assignment.my_network_group_assignment
+    id = "<my_network_group_assignment_id>"
+}

examples/resources/uxi_network_group_assignment/resource.tf

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+resource "uxi_network_group_assignment" "my_network_group_assignment" {
+    network_id = uxi_wired_network.my_network.id
+    group_id = uxi_group.my_group.id
+}