Add Code Metadata rule to soong/testing.

This Cl adds a new rule to Soong to generate code ownership metadata. Also, this CL adds a provider in the Java SDK library to provide generated source files to the Code_metadata rule. Will add providers to other libraries in the future changes.

Bug: 296873595
Change-Id: Ic2e43aa9b161231fea4416d1f0d36b778361d7c5
diff --git a/testing/test.go b/testing/test.go
index 44824e4..cd97a8f 100644
--- a/testing/test.go
+++ b/testing/test.go
@@ -18,4 +18,4 @@
 	"android/soong/android"
 )
 
-var PrepareForTestWithTestSpecBuildComponents = android.FixtureRegisterWithContext(RegisterBuildComponents)
+var PrepareForTestWithTestingBuildComponents = android.FixtureRegisterWithContext(RegisterBuildComponents)