initialize static method
Implementation
static Future<TwitterAuth> initialize(AuthConfig config) async {
assert(config.apiToken.isNotEmpty, 'API Token may not be null or empty.');
assert(config.apiTokenSecret.isNotEmpty,
'API Token Secret may not be null or empty.');
if (_instance == null) {
await _channel.invokeMethod(
_kMethodInstance,
[config.apiToken, config.apiTokenSecret],
);
}
return _instance ??= TwitterAuth._(config);
}