feat: Add netbox_dcim_rack resource

examples/resources/netbox_dcim_rack/import.sh

@@ -0,0 +1,2 @@
+# Racks can be imported by id
+terraform import netbox_dcim_rack.rack_test 1

examples/resources/netbox_dcim_rack/resource.tf

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+resource "netbox_dcim_rack" "rack_test" {
+  name    = "Test rack"
+  site_id = 1
+  height  = 10
+  width   = 10
+
+  tag {
+    name = "tag1"
+    slug = "tag1"
+  }
+
+  custom_field {
+    name = "cf_boolean"
+    type = "boolean"
+    value = "true"
+  }
+
+  custom_field {
+    name = "cf_date"
+    type = "date"
+    value = "2020-12-25"
+  }
+
+  custom_field {
+    name = "cf_text"
+    type = "text"
+    value = "some text"
+  }
+
+  custom_field {
+    name = "cf_integer"
+    type = "integer"
+    value = "10"
+  }
+
+  custom_field {
+    name = "cf_selection"
+    type = "select"
+    value = "1"
+  }
+
+  custom_field {
+    name = "cf_url"
+    type = "url"
+    value = "https://github.com"
+  }
+
+  custom_field {
+    name = "cf_multi_selection"
+    type = "multiselect"
+    value = jsonencode([
+      "0",
+      "1"
+    ])
+  }
+
+  custom_field {
+    name = "cf_json"
+    type = "json"
+    value = jsonencode({
+      stringvalue = "string"
+      boolvalue = false
+      dictionary = {
+        numbervalue = 5
+      }
+    })
+  }
+
+  custom_field {
+    name = "cf_object"
+    type = "object"
+    value = 1
+  }
+
+  custom_field {
+    name = "cf_multi_object"
+    type = "multiobject"
+    value = jsonencode([
+      1,
+      2
+    ])
+  }
+}