Narrow type of some lists in the TypeScript typings file #43

Issue type:

• ➕ Feature request

Short description:

Some functions like inventory are typed to return any[]. While not technically wrong, it could have a more precise typing of ValueItemstack[], which helps with autocomplete.

There are also some functions like nbtWithIntList that take in an any[], though I'm not sure what the type for that would be, or if it would be helpful thanks to #31 still being open.

There are also some functions that could maybe use generics to get a more complete typing, ie operatorMap, though I am not familiar enough with TypeScript to give a concrete suggestion