Module mysql.protocol.comms

Consider this module the main entry point for the low-level MySQL/MariaDB protocol code. The other modules in mysql.protocol are mainly tools to support this module.

Previously, the code handling low-level protocol details was scattered all across the library. Such functionality has been factored out into this module, to be kept in one place for better encapsulation and to facilitate further cleanup and refactoring.

EXPECT MAJOR CHANGES to this entire mysql.protocol sub-package until it eventually settles into what will eventually become a low-level library containing the bulk of the MySQL/MariaDB-specific code. Hang on tight...

Next tasks for this sub-package's cleanup: - Reduce this module's reliance on Connection. - Abstract out a PacketStream to clean up getPacket and related functionality.