Make RippleShader support circle and rounded box shapes.

There will be a follow up CL for adding a oval shape.
This CL breaks the RippleShader into smaller pieces
and glue only the neccessary parts together when
initializing.

Note that this CL, the rounded box shape is not being
used.

Bug: b/237282686
Test: Manual, WiredChargingRippleControllerTest

Change-Id: I09091a612e3307a76a0bc938ce0810153541243a