RTCIceServer constructor
      
      RTCIceServer({ 
    
    
- dynamic urls,
- String? username,
- String? credential,
- RTCIceCredentialType? credentialType,
Implementation
factory RTCIceServer(
        {dynamic urls,
        String? username,
        String? credential,
        RTCIceCredentialType? credentialType}) =>
    RTCIceServer._(
        urls: urls ?? undefined,
        username: username ?? undefined,
        credential: credential ?? undefined,
        credentialType:
            credentialType?.value ?? RTCIceCredentialType.password.value);