Add path autocompletion suggester

[jdcowf]

A path auto-completer/suggester would be helpful for input boxes. This seems like a common enough use case that it'd be helpful to have a standard implementation of it.

Also, this is far more helpful if Suggeter can support returning a list of suggestion as also requested here: #2330 (comment).

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[tconbeer]

I have one of these here if you want to take a gander:
https://github.com/tconbeer/textual-textarea/blob/main/src/textual_textarea/path_input.py

[jtyers]

And this: https://github.com/darrenburns/textual-autocomplete

[willmcgugan]

It's not a bad idea. Moving to discussions for now, but this may eventually get in to the core lib.