Stable release compatible with AMPHP v3 and fibers! 🎉

As with other libraries compatible with AMPHP v3, most cases of parameters or returns of Promise<ResolutionType> have been replaced with ResolutionType.

• Classes and interfaces now are prefixed with Mysql to avoid collisions with similar names from other libraries.
• Marked most classes as internal, leaving only interfaces and concrete implementations required to use the API or create a custom connector.
• MysqlTransaction now extends MysqlLink instead of MysqlExecutor to support nested transactions.
• MysqlDataType is now an enum of MySQL data type codes and methods to decode data based on type.
• Result set field data is now available from MysqlResult::getColumnDefinitions() which returns an array of MysqlColumnDefinition objects corresponding to the result set rows.
• The second param of MysqlStatement::bind() now requires a string. Binding only makes sense with long strings anyway.
• MysqlConnection is now an interface extending SqlConnection, with SocketMysqlConnection being the implementation.
• Removed MysqlConnector since the interface was replaced by template types on SqlConnector, i.e. SqlConnector<MysqlConfig, MysqlConnection>