Add AbstractArrow#getMaxLifetimeTicks

[PsyGuy007-sys]

Expose the configured despawn lifetime for AbstractArrow.

[lynxplay]

Hi and welcome to paper 🥳

Thank you for your PR!
However for now I'll be closing this and asking you to open a feature request for further discussion on what you are trying to achieve here.
The method in its current form is pretty broken to the point that I don't think a PR makes sense yet.
At the core of this lies the fact that an arrow has differing despawning times depending on its inGround state or not.

First, an arrow in the air would respect paper's despawnTime/TTL setting
It would also respect the https://github.com/PaperMC/Paper/blob/main/paper-server/patches/sources/net/minecraft/world/entity/projectile/AbstractArrow.java.patch#L33 measure (to be removed in favour of TTL tho)
Once in ground the method you created would probably work but you can see how this does definitely not work for in-air arrows or arrows in statis chambers.

Throw us an issue and detail the "why" you need such a method and we can work on a solution in the issue :)