Instantly run task after write operation

[Beaness]

Once again #1460

Right now it's possible other packets get written before the promise is completed, If you want to write a packet right after another packet using getTasksAfterSend it's possible another packet gets written inbetween. This solves it for spigot (sponge needs a different type of implementation, probably overwriting the whole write function to execute the tasks).

However this seems to have caused issues

@Axionize (packetevents discord):
GrimAnticheat/Grim#2589
GrimAnticheat/Grim#2588
GrimAnticheat/Grim#2587
GrimAnticheat/Grim#2586
GrimAnticheat/Grim#2586
BadpacketsN also starts flagging
amongst many otherthings

Marked as draft until the issues have been fixed

[Beaness]

No longer marked as draft, after further analysis it seems to be that the merge commit with Grim PacketEvents had inverted preVIa (GrimAnticheat@2f4163f#diff-3167a052813eba4c51f921f2e6d380977bd1de679ffb6e0bb62a1897d8c2c0bf)
Also the implementation of this w/ preVia requires extra logic to persist task order

tail
    -> normal PacketEvents   // sees packet first, registers/runs normal task
    -> ViaVersion
    -> preVia PacketEvents   // sees packet second, registers/runs preVia task
    -> head/socket

  Before PR:

  normal PE sees A       // adds normal task to promise first
  preVia PE sees A       // adds preVia task to same promise second
  promise completes
  normal task runs       // first registered
  preVia task runs       // second registered

  After PR:

  normal PE sees A
  normal PE calls ctx.write(A)
    -> ViaVersion
    -> preVia PE sees A
    -> preVia PE calls ctx.write(A)
    -> preVia task runs     // runs while nested inside normal ctx.write(A)
  normal task runs          // runs after ctx.write(A) returns to normal PE

A solution for this would be by instead of running the post tasks in preVia it adds them to a collection in normal pe handler so that order is persisted and the normal pe handler can run them after the write. But current PacketEvents does not implement preVia injection until #1446 is merged.