[Feature] Multiple installations of the same program

[notraiday]

Describe the solution you'd like

Since every program in official buckets is portable it must be very easy to make it possible to create multiple installations of the same program with different persist folders and\or of different versions of the same program

Example:
scoop install firefox --label test
or
scoop install firefox#test

Will create apps/firefox#test and persist/firefox#test folders and install program there.
Also it should add Firefox#test or something more pretty like Firefox [test].
This app must be threaten as different from original one so it must have it's own install.json.

But i don't really know what to do with shims :). Shim with # in it looks strange