This also moves expandable and transformation into their own packages, as was originally intended (but they had resources, which was problematic at that time). CoordinatorLayout has been moved out of the typical source root to ease its later deletion (when it has made it into core-ui).
PiperOrigin-RevId: 180728823
Bazel is happier if Java/Java test roots are named 'java' and 'javatests', and
this will mean that once we create a BUILD file for
android/support/design/{widget,internal}/ we'll no longer need a custom package
specified in our build (which tends to cause build problems that manifest quite
weirdly). This commit doesn't attempt to refactor the build at all yet, and is
just a pure move.
PiperOrigin-RevId: 178060739
