* [flutter_tools] Support zipped application bundles for macOS

It is not possible to directly produce a directory (.app) in some build systems
but rather it must be zip'ed before being passed to the tool for
running. This adds support for attempting to extract an application
bundle from a zip file if the bundle is not already a directory. This
uses very similar code from lib/src/application_package.dart which is
used for extracting an ipa for iOS.

This introduces tests for the macos/application_package.dart behavior which did not exist before. These tests cover the changes in the PR and some of the existing behavior, but do not cover everything in that file.