[Suggestion] Configurable ItemSlot stack count format

[ChAoSUnItY]

Currently format is hardcoded to calling NumberFormat#formatWithMaxDigits, which always contains 4 digit precision, but 4 digits seems to be to small (considering the scale). Perhaps we can have a Function<String, String> that allows user to modify amount text display?

The actual looking with 4 digit precision format can be seen here

[brachy84]

That seems to be an issue with your font

[ChAoSUnItY]

This is used with StackUp, which I suppose it modifies the render of vanilla slot item stack count to make it human-readable (haven't look into the patch it uses), but at least this refactor could be helpful without installing any other font mods to fix the display issue.