Make end island generate only on first portal join

Description

Is your feature request related to a problem?

Right now, when a user creates a overworld island, their end island is automatically generated, which is a waste of space. I would like that the end island would be generated only when the user tries to go through the portal.

Describe the solution you’d like us to implement.

1. When user starts island, do not generate the schematic on the end. (https://github.com/BentoBoxWorld/BentoBox/blob/8581522475b2b819ca7448f43f2ce016e5036665/src/main/java/world/bentobox/bentobox/managers/island/NewIsland.java#L223)
2. Do not generate

spawnPoint:
  THE_END: SkyBlock_the_end:-1:126:-1:1134395392:1106247680

(https://github.com/BentoBoxWorld/BentoBox/blob/587e400287a92dd28e8989fb837c01e39c92c292/src/main/java/world/bentobox/bentobox/schems/Paster.java#L260) at first.

1. When teleporting to end (https://github.com/BentoBoxWorld/BentoBox/blob/8581522475b2b819ca7448f43f2ce016e5036665/src/main/java/world/bentobox/bentobox/listeners/PortalTeleportationListener.java#L49) check if the user has end island (it can be checked by checking if the user has a spawnpoint on the end). , generate the schematic and the spawnpoint

[BONNe]

It is not hard to implement but…

teleporting to the nether and end will be much trickier… there will be a lot of issues when players stuck into portals without being able to smoothly teleport into the other dimension on the first time, as islands on another side will be necessary to create.

And really… space on a hard drive? You will not grain anything… probably some 1-2mb per player. Or even less, as space in the other end is still reserved, just without blocks.

And without reserving space it will not be possible for other players to get into other dimensions without issues.

Off course if bentobox change code so player reserve island space in dimension only when he joins that dimension (grid per world) would fix that, but it will mean more processing on teleports and checking island owners as it will be based per dimension, not per coordinate on a single grid.

[Poslovitch]

And if we kept track of which bundle was used, what would happen if one of the blueprint gets removed/edited ? Issues would happen because of that too.