list method
List the integrations in the guild.
Implementation
Future<List<Integration>> list() async {
final route = HttpRoute()
..guilds(id: guildId.toString())
..integrations();
final request = BasicRequest(route);
final response = await client.httpHandler.executeSafe(request);
final integrations = parseMany(response.jsonBody as List, parse);
integrations.forEach(client.updateCacheWith);
return integrations;
}