Implement MySqlConnection.InfoMessage event

[ststeiger]

MySqlConnector lacks support for InfoMessage.

https://dev.mysql.com/doc/dev/connector-net/8.0/html/E_MySql_Data_MySqlClient_MySqlConnection_InfoMessage.htm

static void myConnection_InfoMessage(object sender, System.Data.SqlClient.SqlInfoMessageEventArgs e)
{
    System.Console.WriteLine(e.Message);
}


    ((System.Data.SqlClient.SqlConnection) con).InfoMessage += new System.Data.SqlClient.SqlInfoMessageEventHandler(myConnection_InfoMessage);

NpgSql has this, too

    using (Npgsql.NpgsqlConnection con = new Npgsql.NpgsqlConnection(csb.ConnectionString))
    {
        con.Notice += NoticeEventHandler;
        con.Notification += NotificationEventHandler;

[bgrainger]

Need to add:

• MySqlError class
• MySqlInfoMessageEventArgs class
• MySqlConnection.InfoMessage event
• routine to execute SHOW WARNINGS and raise the event with the parsed warnings

[bgrainger]

Added in 0.48.0.