(Feature request) Support extensions with multiple suffixes

[althonos]

Hi there,
currently, fd does not support extensions with multiple suffixes in them, like tar.gz and the like. Of course, one could simply run fd tar.gz, but unfortunately this will also find some other files (such as *.tar.gz.sig). The correct workaround would be fd tar.gz\$, which starts to get cumbersome !

I could probably have a look at the code myself, since I don't think this should be too complicated to implement, but I'd like to have your opinion about it.

[sharkdp]

I would have actually needed this just yesterday. Completely agreed, this would be nice to have.

I think it's not completely trivial to implement this because we currently extract the extension via
Path::extension - which just extracts everything after the final . - and match that against the pattern. I guess we would have to resort to something like str::ends_with.

[sharkdp]

Closed via #215.