Add Grow Speed upgrade for culture and spawn speed upgrade for mob spawner on a island

[BBOUQUIER]

Is your feature request related to a problem?

I create a One block server and i want them to be abdle to have upgrade on speed

Describe the solution you'd like.

I want player to be able to upgrade grow speed and spawn speed on there island.

Describe alternatives you've considered.

Maybe add a plugin that help to do that but i don't know if i can configure it to a insland

Agreements

• I have searched for and ensured there isn't already an open issue regarding this.
• I have ensured the feature I'm requesting isn't already in the latest supported BentoBox build or Addons.

Other

No response