[Feature] upgrades to support MySQL latest versions

[evereq]

We need to upgrade packages.json and other places (e.g., docker-compose) to use the latest versions of MySQL everywhere.

Please make sure:
a) Docker-compose use the latest MySQL
b) All docs updated with the latest MySQL versions
3) API (MySQL client package) works well with latest MySQL versions

[evereq]

Related to #381

[Redominus]

Using mysql package looks like a dead end. Probably replacing it with mysql2 would be a better option.

[evereq]

@rahul-rocket can you work to update MySQL driver to latest version of https://github.com/sidorares/node-mysql2 and also update the PostgreSQL driver to the latest and other dependencies (E.g. ORM etc)