This is a generalization of the existing (and oddly specific)
String.chunk/2 function that takes a string and a single-argument predicate
function, returning a list of strings.
e.g.
String.chunk_by(" foo bar ", &(&1 =~ ~r/\w/))
# => [" ", "foo", " ", "bar", " "]
The above example makes problems such as "wrap text at <line limit>
preserving whitespace" or "truncate string to x number of words while
preserving whitespace" simpler.
The actual change would be pretty small and consist of renaming `chunk` to
`chunk_by`, removing a line, and re-defining `chunk` as a slightly
specialized call to `chunk_by`
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