refactor: tighten internal types

fix(foreach): improve type of forEach function

feat(foreach): add forEach function

feat(excludenull): add excludeNull function

feat(types): export function signatures in preference to const lambdas

feat(shuffle): add shuffle function

feat(uniquebyidentitywithhash): pass index to hashing function

feat(foldmapright): add foldMapRight functions

feat(scanmonoid): delete scanMonoid functions

These functions were named incorrectly and are not useful. I don't think it's a good or useful idea
to have variants of scan that do not take an initial value.

BREAKING CHANGE: The functions scanMonoid, scanMonoidFn, scanMonoidRight, and scanMonoidRightFn are
removed. Use scan, scanFn, scanRight, or scanRightFn instead.

feat(foldmonoid): delete foldMonoid functions

These functions were named incorrectly and are not useful. I don't think it's a good or useful idea
to have variants of fold that do not take an initial value.

BREAKING CHANGE: The functions foldMonoid, foldMonoidFn, foldMonoidRight, and foldMonoidRightFn are
removed. Use fold, foldFn, foldRight, or foldRightFn instead.