Created game server rollout data source

.changelog/3727.txt

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+```release-note:new-datasource
+google_game_services_game_server_deployment_rollout (beta only)
+```

google/data_google_game_services_game_server_deployment_rollout.go

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+package google

google/data_google_game_services_game_server_deployment_rollout_test.go

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+package google

website/docs/d/game_services_game_server_deployment_rollout.html.markdown

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+---
+subcategory: "Game Servers"
+layout: "google"
+page_title: "Google: google_game_services_game_server_deployment_rollout"
+sidebar_current: "docs-google-datasource-game-services-game-server-deployment-rollout"
+description: |-
+  Get the rollout state.
+---
+
+# google\_game\_services\_game\_server\_deployment\_rollout
+
+Use this data source to get the rollout state. 
+
+https://cloud.google.com/game-servers/docs/reference/rest/v1beta/GameServerDeploymentRollout
+
+## Example Usage 
+
+
+```hcl
+data "google_game_services_game_server_deployment_rollout" "qa" {
+    provider = google-beta
+    deployment_id = "tf-test-deployment-s8sn12jt2c"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+
+* `deployment_id` - (Required)
+  The deployment to get the rollout state from. Only 1 rollout must be associated with each deployment.
+
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following attributes are exported:
+
+* `default_game_server_config` -
+  This field points to the game server config that is
+  applied by default to all realms and clusters. For example,
+  `projects/my-project/locations/global/gameServerDeployments/my-game/configs/my-config`.
+
+
+* `game_server_config_overrides` -
+  The game_server_config_overrides contains the per game server config
+  overrides. The overrides are processed in the order they are listed. As
+  soon as a match is found for a cluster, the rest of the list is not
+  processed.  Structure is documented below.
+
+* `project` - The ID of the project in which the resource belongs.
+    If it is not provided, the provider project is used.
+
+
+The `game_server_config_overrides` block contains:
+
+* `realms_selector` -
+  Selection by realms.  Structure is documented below.
+
+* `config_version` -
+  Version of the configuration.
+
+The `realms_selector` block contains:
+
+* `realms` -
+  List of realms to match against.
+
+* `id` - an identifier for the resource with format `projects/{{project}}/locations/global/gameServerDeployments/{{deployment_id}}/rollout`
+
+* `name` -
+  The resource id of the game server deployment
+  eg: `projects/my-project/locations/global/gameServerDeployments/my-deployment/rollout`.

website/google.erb

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     </ul>
     </li>
 
+    <li>
+    <a href="#">Game Servers</a>
+    <ul class="nav">
+      <li>
+        <a href="#">Data Sources</a>
+        <ul class="nav nav-auto-expand">
+
+          <li>
+          <a href="/docs/providers/google/d/game_services_game_server_deployment_rollout.html">google_game_services_game_server_deployment_rollout</a>
+          </li>
+
+        </ul>
+      </li>
+    </ul>
+    </li>
+
     <li>
     <a href="#">Identity Platform</a>
     <ul class="nav">