[Battery] RTL support

Apply the following layoutDirection-dependent changes in the unified
battery icon:

1. Fill layer now reverses the canvas
2. Frame and frame-bg are auto-mirrored
3. Attributions have checks for RTL mode layouts and adjust their
   offsets as such

Numerical text does not have an LTR rendering mode, so the foreground
attributions of the battery do not mirror.

Test: manual setting RTL mode
Bug: 314812750
Flag: ACONFIG com.android.settingslib.flags.new_status_bar_icons DEVELOPMENT
Change-Id: I581ec376e6004a76dbc96e1ec0be5e14dafa8fb7