createVersion method
      
Future<CreateContainerVersionResponse> 
createVersion(
    
- CreateContainerVersionRequestVersionOptions request,
- String path, {
- String? $fields,
Creates a Container Version from the entities present in the workspace, deletes the workspace, and sets the base container version to the newly created version.
request - The metadata request object.
Request parameters:
path - GTM Workspace's API relative path. Example:
accounts/{account_id}/containers/{container_id}/workspaces/{workspace_id}
Value must have pattern
^accounts/\[^/\]+/containers/\[^/\]+/workspaces/\[^/\]+$.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a CreateContainerVersionResponse.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<CreateContainerVersionResponse> createVersion(
  CreateContainerVersionRequestVersionOptions request,
  core.String path, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'tagmanager/v2/' + core.Uri.encodeFull('$path') + ':create_version';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return CreateContainerVersionResponse.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}