perf: get rid of guice overhead when accessing the player & world manager

[Vrganj]

Overview

Description

Return already injected fields in BukkitPlatform to avoid slow
Injector access. Should speed up pretty much everything.

See #3315 for more information

Submitter Checklist

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1. Make sure you are opening from a topic branch (/feature/fix/docs/ branch (right side)) and not your main branch.
2. Ensure that the pull request title represents the desired changelog entry.
3. New public fields and methods are annotated with @since TODO.
4. I read and followed the contribution guidelines.

[SirYwell]

Looks good.