Add 'format everything in and under path' as ui option

[sanjarcode]

Goal: to format all files (at any level) at a path (say src). The most general regex.
Todo: This should be a UI option.
Problem: I always forget the regex for this.

[sanjarcode]

For anyone wanting the same, the regex for (in and under src) is src/**/*.* . See https://stackoverflow.com/a/69575950/11392807 for explanations