Replace parsing string with an abstract Stream

[honungsburk]

It should be possible to allow the parsing of any Stream-like structure by replacing the explicit dependency on string with an interface Stream

See

• purescript's eulalie
• haskell's parsec

[honungsburk]

kombo makes a lot of assumptions based on the input being text. Kombo should stay text only and if we want to build a parser combinator library on top of abstract streams then that is done in a new package.

[honungsburk]

Currently, since we are dealing with text, kombo keeps track of the row and column of problems and contexts. But rows do not make sense for an abstract stream (hence my previous comment). It is definitely worth exploring. Who knows? Maybe it is possible to generalize.