chore(make): adds basic workflow tasks

* Adds tasks for formatting, linting, and testing.
* Vendors flutter to a specific version.

Some refinement is needed and we will need to explore how to get the Atom IDE support for dart and flutter to play nice with the Vendored flutter version.

Closes #2

Change-Id: I7a8f90951d06dc2646962f09ab9181a888e9735e
8 files changed