uwptool is a helper tool used by the flutter command-line tool. It can
be thought of as analogous to adb for Android or libimobiledevice for
iOS.
Its core functions are:
* List installed apps. (included in this patch)
* Launch an app with a set of launch arguments. (included in this patch)
* Install an app (included in a later patch).
* Uninstall an app (included in a later patch).
Part of https://github.com/flutter/flutter/issues/81756
82199aacc5