Roll meta-flutter

Roll meta-flutter

- Roll ivi-homescreen
  Makes default window type Background. No-op in case of desktop.
- Remove ivi-homescreen system service logic in favor of
  using bbappend for a given platform
- add recipe for flutter-auto
  this points to the `agl` branch on https://github.com/toyota-connected/ivi-homescreen
  this renames homescreen to flutter-auto
- Replaces explicit recipe names with bbclass implementations
  `release` becomes `runtimerelease`
  `profile` becomes `runtimeprofile`
  `debug` becomes `runtimedebug`
- tools/setup_flutter_workspace.py
  job aid that setups a FLUTTER_WORKSPACE based on configuration file
- adds flutter_sdk.version file to engine_sdk.zip.
  This allows querying runtimedebug target to get flutter SDK commit
- Backend selection for ivi-homescreen
  defaults to backend-egl unless DISTRO_FEATURES includes vulkan
- Localization test app

Bug-AGL: SPEC-4326

Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
Change-Id: I366fe6881d4c4896995e46686585cbb2939d572e