Archive tasks once invoiced

[thirstyice]

What version of Invoice Ninja are you running? ie v4.5 / v5
v5.8.56

What environment are you running?
ZIP

Have you searched existing issues/requests?
Yes

Screenshots

Additional context
Would be great to have an option to automatically archive tasks once they have been invoiced.
Alternatively, implementing #2118 so that tasks get archived automatically with the invoice they're attached to would also fulfill my needs.

Even better (but probably much more complicated) would be having some kind of simple automation system, like "when x happens, do y" so that these kinds of repetitive tasks could be automated however works best for each application