Add Statistics Callback

[Chitasa]

Reopening #1962

Needs PrismarineJS/minecraft-data#714

[Chitasa]

This shouldn't be merged until the necessary data is brought to mcData. The necessary data being the translation map from achievement category as a number to string and a class to unify this across versions. This requires the mcData part to be done thought.

#1962 (comment)

[Chitasa]

https://gist.github.com/Alvin-LB/8d0d13db00b3c00fd0e822a562025eff
https://wiki.vg/Protocol#Statistics

[Chitasa]

1.8.8 Tests failing because of PrismarineJS/minecraft-data#714
1.13.2+ Tests failing because we need translation mappings

[Chitasa]

All the statistics tests are going to be failing :I
Requires features added here: PrismarineJS/minecraft-data#714

Probably need to move mappings out of statistics.js and into minecraft-data

[rom1504]

please finish

[Chitasa]

On vacation right now, I'll fix these things when I get back

[rom1504]

Please re-open if you want to finish it