TouchpadInputMapper: support touchpad capture

This allows an app to capture the touchpad and receive "raw" touch
information from it. Since some specifics (such as how size is
calculated) aren't well-defined in documentation or tests currently,
when in doubt I tried to match the behaviour of MultiTouchInputMapper in
captured mode.

Bug: b/259547750
Test: atest inputflinger_tests
Test: use a test app to dump captured events, manually verify and
      compare with old behaviour
Change-Id: I482cce6d16ed6f947ce86e8453ddb2c9789d4d00