[Integration] GreptimeDB database integration

[sunng87]

GreptimeDB is an open-source time series database. It has built-in support for mysql wire-protocol. I have tested it as a mysql database in mindsdb and it works out of box.

It would be nice to include greptimedb on mindsdb integration. I think there are tasks:

• Add a new engine called greptimedb although it doesn't require much development and new dependency
• Add docs on mindsdb's doc site

Please let me know if I can help.

[ZoranPandovski]

It sounds like it can be supported by just extending the MySQLHandler. For further reference check https://docs.mindsdb.com/contribute/data-handlers

[sunng87]

Oh nice! I will work on this.

[sunng87]

@ZoranPandovski I've created PR #9071 by extending MySQLHandler and you may want to review it.