DO NOT MERGE Refactor StatusBar and CarStatusBar to optimize automotive boot time.

Test: Robolectric -- Robolectric results are identical before and after this change.

Test: Manual -- Hawk is booting successfully and interacting with different
 parts of CarStatusBar is not failing.

Test: Manual -- Pixel 2 is booting successfully and interacting with different
 parts of StatusBar is not failing.

Bug: 142342652
Bug: 140999054
Change-Id: Idf5e152aa661f06b7a041d39d759595636807dce