dropCollection method
Drops a collection https://www.arangodb.com/docs/stable/http/collection-creating.html#drops-a-collection
Implementation
Future<IdResponse> dropCollection(String name,
{bool isSystem = false}) async {
final answer = await _httpDelete(['_db', db, '_api', 'collection', name],
queryParameters: {'isSystem': jsonEncode(isSystem)});
final ret = _toIdResponse(answer);
return ret;
}