Support updating without knowing the file

[nitrocode]

Like tfupdate, it would be nice to update the hcl using hcledit without knowing the exact file to update.

E.g.

tfupdate terraform -v 0.12.16 -r ./

Here is a current command of hcledit

hcledit attribute append resource.foo.bar.nested.attr3 '"val3"' --newline --update --file main.tf

Perhaps a directory argument and/or recursive flag could be added with --file as optional?

hcledit attribute append resource.foo.bar.nested.attr3 '"val3"' --newline --update -r ./