Add option to increase displayed log lines in pm2 monit

DISCLAIMER: This is a feature request so I can't use the given markdown template for new issues

Reasoning

If you use pm2 monit you only see a few log lines (in my case just 9) per process which is not really useful. To make pm2 monit more useful it would be nice if you could configure how much log lines should be displayed for each process.

Desired Implementation

Add a lines option, which allows to display more lines for each process:

pm2 monit --lines 100

Considered Alternatives

I know you can use

pm2 logs --lines 100

but this is not really user-friendly if you want to monitor multiple processes at once.