Create collection-ktx adapted from core-ktx util.

Bug: 69247886
Test: ./gradlew :collection-ktx:build
Change-Id: I08e006328afd178e4c571a9c742e1c523dd13d6c
diff --git a/settings.gradle b/settings.gradle
index c402bf3..0ed31e3 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -39,6 +39,7 @@
 includeProject(":car", "car")
 includeProject(":cardview", "cardview")
 includeProject(":collection", "collection")
+includeProject(":collection-ktx", "collection-ktx")
 includeProject(":coordinatorlayout", "coordinatorlayout")
 includeProject(":cursoradapter", "cursoradapter")
 includeProject(":browser", "browser")
@@ -135,6 +136,7 @@
 /////////////////////////////
 
 includeProject(":internal-testutils", "testutils")
+includeProject(":internal-testutils-ktx", "testutils-ktx")
 
 /////////////////////////////
 //