[Status Bar] Implement per-rotation bottom aligned margin configuration

This allows to have bottom aligned status bar content. Will be used when
the content shouldn't be centered vertically within the status bar.

A bottom margin of 0 means that the content will be aligned to the
bottom of the status bar.
A bottom margin of < 0 means that the value will be ignored, and that
the content will be centered vertically.

Change-Id: Ic252d47e3367fe81a833235b0ed05ef535fc9a0e
Test: Manual
Test: Unit tests on this CL
Bug: 309775101
Flag: NONE