Introduces a `--walk` flag which can be used to tell `treefmt` how to traverse the directory specified by `--tree-root`.
By default, it will attempt to use `git ls-files`. If this fails, it falls back to using the filesystem.
You can explicitly traverse the filesystem instead of using git by providing `--walk filesystem`.
Close#1
Reviewed-on: #19
Reviewed-by: Jonas Chevalier <zimbatm@noreply.git.numtide.com>
Co-authored-by: Brian McGee <brian@bmcgee.ie>
Co-committed-by: Brian McGee <brian@bmcgee.ie>
