Extended glob patter for findFiles

[wclr]

It seems that vscod.workspace.findFiles doesn't support extended patterns such as:

**/+(gulpfile.js|package.json) or '**/@(node_modules|jspm_packages|bower_components)/**'

http://www.linuxjournal.com/content/bash-extended-globbing

it is quite limiting.

[wclr]

Or another proposal is to add ability for mult-pattern so it would be possible to pass array of simple patterns.

BTW findFIles works quite slowly is it because it checks all the nested folders and tests all files against exclude pattern?

[bpasero]

Unlikely given that we now depend on RipGrep glob handling, but I let @roblourens decide

[roblourens]

I opened this issue to allow passing an array of patterns: #38545. I much prefer that over supporting extended glob syntax.