Move SceneTransitionLayout to a separate library (1/2)

This CL is a pure move that moves the code for SceneTransitionLayout
inside a separate library, so that it can be easily copied and reused as
part of the AndroidX benchmarks.

Bug: 300622679
Test: atest PlatformComposeSceneTransitionLayoutTests
Change-Id: I97cbe4515b1bc28db59c9f1234df823d727bc882
diff --git a/packages/SystemUI/compose/scene/OWNERS b/packages/SystemUI/compose/scene/OWNERS
new file mode 100644
index 0000000..33a59c2
--- /dev/null
+++ b/packages/SystemUI/compose/scene/OWNERS
@@ -0,0 +1,13 @@
+set noparent
+
+# Bug component: 1184816
+
+jdemeulenaere@google.com
+omarmt@google.com
+
+# SysUI Dr No's.
+# Don't send reviews here.
+dsandler@android.com
+cinek@google.com
+juliacr@google.com
+pixel@google.com
\ No newline at end of file