feat(arrays): add pairwise

Add new pairwise function and tests.

feat(sets): Add `every` function

Add function to check if every item in the collection satisfies the given criteria.

feat(arrays): Support ReadonlyArray for sources

Allow any input to Array functions to be of type ReadonlyArray as we don't ever modify the source
collection. Also add JSDoc examples so it's clear that you can still use normal arrays as inputs.

fix(init): Fix when an increment goes beyond the 'to'

When the increment goes beyond to 'to' value, stop at the element before.

feat(arrays): Add distinct function

Add non-by version of distinct for arrays of comparable types.

fix #6

feat(arrays): Add index to callbacks

Add index argument to iterable callbacks.

re #11

docs(TypeDoc): Count & length

Add documentation for count and length functions.

Merge pull request #10 from danielrbradley/pipe-overloads

Pipe overloads

Merge pull request #7 from danielrbradley/next-features

Sort descending & reversal

Merge pull request #2 from danielrbradley/next-modules

Add next modules