feat: Added a new feature for distributing (--outputToOneDirectory) all assets of a certain category into a single dir

[ramitha]

• Added a new feature for distributing (--outputToOneDirectory) all assets of a certain category into a single directory by renaming the asset to iconName-flavor
• distribute with --colorScheme flag now has a default behavior.
  • It distributes the mixed assets when present, otherwise defaults to the light and dark assets
  • (Using -c mixed light only worked previously because the -mixed asset was overriding the light asset as it had the same name)
• This fix also slightly changes the behavior of the --withImage flag, in that it now acts as a switch. If it is not present, it only distributes assets without an image by default. (The assumption here is that you won't need both versions of an asset at the same time)
• --outputToOneDirectory respects the --colorScheme flag, --withImage flag, --doNotRemoveSuffix, and --groupByCategory flags