Add static RemoteEdgeButton to wear:compose:remote:remote-material3

Implement a static version of EdgeButton in remote-material3, supporting
the same sizes (ExtraSmall, Small, Medium, Large) and color styles
(filled, filled tonal, filled variant, outlined) as Wear Compose.
Uses the RemotePathScope conic builder with RemoteFloat expressions
for defining the edge button shape.

Also add corresponding samples, previews, demos, and screenshot tests.

Test: ./gradlew :wear:compose:remote:remote-material3:test :wear:compose:remote:remote-material3:connectedAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=androidx.wear.compose.remote.material3.RemoteEdgeButtonTest,androidx.wear.compose.remote.material3.samples.RemoteEdgeButtonSampleTest
Bug: 548535872
Relnote: "Added `RemoteEdgeButton` component to `wear:compose:remote:remote-material3`."
TAG=agy
CONV=a30c3400-5214-497c-bc52-e5927fb79c9a

Change-Id: I017a62f443ab3d7a820506f732d022364e496d8c