Add RemoteLinearProgressIndicator demos

Adds a demo screen for RemoteLinearProgressIndicator in
integration-tests:demos showcasing various preview configurations:
default, custom width, scaled dot, custom colors, disabled,
and animated.

Bug: 553908609
Test: ./gradlew :wear:compose:remote:integration-tests:demos:lintDebug :wear:compose:remote:integration-tests:demos:assembleDebug
TAG=agy
CONV=3e429f1b-1b06-4e6d-97ed-608679feee5f

Change-Id: I0c4a7b65b9ef4bfd2d960273af41e8502ee44cc8