Support Forge flag "--skip script"

[PaulRBerg]

Requested by Matt Solomon here.

There are two ways in which this could be implemented:

1. Add a new skip-script input.
2. Add a new input called skip that is a string and allows users to pass whatever they want.
   • The advantage of this would be that users could skip other directories, not just test or script
   • The disadvantage is that it would be quite complicated to implement - I need to check if Forge takes a glob path or it has to be a single directory

[mds1]

forge's --skip does accept globs, and --skip test and --skip script are just aliases for *.t.sol and *.s.sol respectively (i.e. they don't actually skip the test and script folders, just files matching those extensions).

• Here is where you can see it's an alias
• Here is an example skipping with globs instead

[PaulRBerg]

Fantastic, thanks for the color, @mds1.