[1.22+] Tighten getEnchantPowerBonus to BlockGetter

[Shadows-of-Fire]

I have a situation where I would like to resolve the enchant power of a block but might not have access to a level (i.e. in a tooltip).

Currently, the best attempt is to make a fake LevelReader which returns reasonable results from the methods one might expect someone to call, and catching any exceptions. I think there's no reason this method needs access to the full LevelReader and would be sufficiently executable with just BlockGetter (which also makes providing an "empty" level easier).

The most common case is resolving the BlockEntity or the states of nearby blocks, both of which are possible through BlockGetter. I don't see the additional context of LevelReader being useful here whatsoever.

[Technici4n]

We could make the level @Nullable as an alternative.

[Shadows-of-Fire]

I think it's unreasonable to expect implementers to have to deal with a @Nullable level (since it pushes the burden of a null check on everyone else) - but BlockGetter should provide all context that could be reasonably necessary without impacting implementers.