Sync with FLK 1.12.3, target MC 1.21

[ghost]

Superscedes #98, original PR message will be embeded below...

• Syncs with FLK 1.12.3 by embedding it.
• Updates to QSL 1.21.1.
• Removes the language adapter in favour of FLK's.
• Applies the later suggestions by 770grappenmaker
• Updates the gradle wrapper to latest (8.10.2).
• Bumps the major version due to api surface breakage.

Main highlights :

• item tooltip API now takes a DataComponentMap argument instead of an NbtCompound
• some Brigadier DSL methods now take an additional context parameter
  • future refactors of the DSL could hide this parameter away inside a receiver object
• some Brigadier classes are still unmapped
  Fixes Update for Kotlin 2.0.0 #96 and Update to 1.21 #97

[ghost]

Closing this in favour for work I've already done tonight to ship KT 2.0.20 since this PR does not actually target 1.21 QSL.

Converting this to a draft and updating FLK and KT since I had already done that before realising this code still depends on 1.20.4's QSL.

[ghost]

Requires testing of the bundling of FLK I did but otherwise should be good to go.

Oh and once that's tested I can remove the language adapter code from qkl core instead of just removing the reference.

[OroArmor]

Looks like you are defaulting to FLK for the language provider and just keeping the api?

[ghost]

Yeah that's the plan going forward, core would effectively be gone unless we want to bundle more libraries in the future.

[ghost]

I believe this PR is ready to be merged, please also see and maybe adjust a little https://discord.com/channels/817576132726620200/1103987526349361192/1294387464848408757.