Grafana Datasource

To get Grafana Datasource for specific account:

	client, err := grafana_datasources.New(apiToken, test_utils.GetLogzIoBaseUrl())
    datasource, err := client.GetForAccount("my-metrics-account-name")

function	func name
get datasource for account	func (c *GrafanaDatasourceClient) GetForAccount(accountName string) (*GrafanaDataSource, error)