Select multiple files from file picker

[tomaszferens]

When I select multiple files with <Tab> in Telescope the plugin ignores it and takes the one I pressed <Enter> on.

Btw. Amazing plugin. It can easily compete with https://github.com/olimorris/codecompanion.nvim

[azorng]

indeed file_picker.lua returns a single file for each picker - we can make it a list instead