Modernize instanceof checks, switch expressions, and error handling

[MattBDev]

Summary

• Consolidate instanceof checks to pattern-variable form and convert legacy switch statements to arrow-form switch expressions across the codebase (NBT streams, block/direction/entity registries, expression compiler, YAML, math utils, etc.)

• Improve error message formatting and use try-with-resources for Closer in BukkitImplLoader

• Errorprone library was added to libs.versions.toml for future work when catching up to upstream. Included it just in case we choose to adopt it too.

[MattBDev]

I think this may result in an NPE. I just want a second opinion on this before I go and fix it before the PR is approved and merged.

[SirYwell]

1. I feel like we shouldn't touch WE classes/code. If they applied similar changes, cherry-picking them might make more sense.
2. So errorprone is included because WE uses it? I'm not exactly a fan of it, due to its tight integration with internal javac apis.
3. The code style seems rather inconsistent (e.g., usage of final in instanceof pattern matching, that said I'm not a fan of noisy final usage at all).
4. It might make more sense to replace Closer usage with try-with-resources completely. AFAIK it's a pre TWR artifact to make dealing with closables easier.