Use sub chunk request system (Fixes light issues, and flickering)

[valaphee]

Add support for the sub chunk request system, which fixes light issues, and flickering on world loading. This also shows lighting issues which will be normally seen in Java Edition, and therefore improve parity.

But I also refactored some variable names in JavaLevelChunkWithLightTranslator to make it easier to understand and more general.

Related issue: #3425