Factor out `Tokens` and `Language`

[jamesdbrock]

Proposal: Move the Parsing.Tokens and Parsing.Language modules out into a separate package purescript-parsing-language.

I don't know why we even have the Haskell and Java parsers included with this library. They feel like they belong in some companion package

#142 (comment)

[jamesdbrock]

In 2016 Dennis Gosnell wanted to use the features of Language in a PureScript project. Based on these two observations

1. purescript-parsing is a port of Parsec
2. Language is a Parsec module

he added Language and Tokens modules to purescript-parsing.

Now he can’t remember what the project was.

Here is a GitHub search for Parsing.Language

Here is a GitHub search for Parsing.Token