Bukkit - Update MinecraftComponentSerializer for 1.21.6/7

[bloodmc]

This PR adds support for Minecraft 1.21.6 by integrating the new ComponentSerialization.CODEC for component serialization, while preserving compatibility with older versions.

[bloodmc]

Works on Paper 1.21.6 but not fully on Spigot. I'll push a fix when I can.

[bloodmc]

Spigot works properly now. The core.HolderLookup$Provider class isn't remapped on Spigot and uses the obf name core.HolderLookup$a.

[bloodmc]

Cached JsonOps.INSTANCE via reflection to avoid repeated class and field lookups. PR should be ready for pull now.

[AnttiMK]

@bloodmc Checkstyle is failing, probably want the build to pass before merging 😅

[jpenilla]

Need to create a registry-aware JsonOps similar to https://github.com/KyoriPowered/adventure-platform-mod/blob/mc/1.21/mod-shared/src/main/java/net/kyori/adventure/platform/modcommon/impl/NonWrappingComponentSerializer.java and https://github.com/PaperMC/Paper/blob/0cadaefc094c1d25eb19332cfebc02f9b5885c4a/paper-server/src/main/java/io/papermc/paper/adventure/PaperAdventure.java#L143

[nossr50]

I've tested this PR in mcMMO and it is working with Paper 1.21.7 builds, hover components and action bar messages are now being sent correctly.

[andrewkm]

Waiting for this on our end as well; currently testing the PR with some custom builds and going well. :)

[AnttiMK]

I've (smoke-)tested this PR alongside Adventure 4.23.0 on the currently "most popular" versions of Spigot and Paper (latest builds of 1.8.8, 1.12.2, 1.16.5, 1.18.2, 1.19.4, 1.20.6 and 1.21.7), and didn't notice any issues. My testing included whether MinecraftComponentSerializer#isSupported() evaluates to true, and that (de)serialization works by checking that the following snippet produces working components:

Component adventureComponent = text("Hello, Adventure!", RED, BOLD);
Object nmsComponent = MinecraftComponentSerializer.get().serialize(adventureComponent);
Component deserializedComponent = MinecraftComponentSerializer.get().deserialize(nmsComponent);

I also threw this into production with Paper 1.21.7 and Citizens (CitizensDev/Citizens2@1049ca6), and didn't notice any issues.

[kezz]

Just for reference for those of you following this PR:

• The PR itself appears to be functional, you are more than welcome to manually include it in your code/plugin/project if you need to.
• We have some issues at the moment relating to the recent publishing changes that are currently blocking this PR from being merged that will be worked on when we have time.

We appreciate your patience 💪