SSL support does not work with Node v12+

When using Node v12+ you will always get an error when trying to connect with SSL.

SSL routines:ssl_choose_client_version:unsupported protocol

The minimum TLS version in node 12 is 1.2, and this module needs to add support for this.

[sidorares]

While above error might be probably solved with added entry to exports, I would prefer to change all deep requires to top level import + property or getters Some things to consider while doing this:

• avoid impact on startup time and memory ( getters and lazy require vs requiring everything upfront )
• need to think about good and consistent names. possible future examples:

import mysql from 'mysql2'

mysql.constants.commandCodes.COM_QUIT; // instead of require('mysql2/lib/constants/commands.js')
mysql.sslProfiles['Amazon RDS']; //  instead of require('mysql2/lib/constants/ssl_profiles')
mysql.constants.capabilityFlags.SSL_VERIFY_SERVER_CERT; // instead of require('mysql2/lib/constants/client.js')

[jjosef]

Seems like a good idea, I think just adding some documentation on this for supporting older MySQL versions in newer node versions would suffice, and improving how to load the Amazon RDS cert.