showChoicePalette to allow entered text as result

Hi again,

I really like that the command palette functionality is available to extension developers already through workspace.showChoicePalette(choices, options).

Currently, an entry from the choices array must be selected, but there is also the filter text that the user enters. It would be great if an option could be added to options to allow it to return the user entered text if it doesn’t match a choice from the array.

This way, it would be possible to create some new thing directly from the palette or select an existing thing from the list.