Bp2Build converter for android_library_import and android_library.

Minor refactor of android_app converted to account for common attributes
between library and app.

Test: go test
Test: ../bazel/ci/bp2build.sh
Change-Id: I60b06eef6d2b9bc2d91f8b83522747ebbe76bbb6
Bug: 215230093
Bug: 215230095
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 07557d6..713ee09 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -34,6 +34,7 @@
         "soong-ui-metrics",
     ],
     testSrcs: [
+        "aar_conversion_test.go",
         "android_app_certificate_conversion_test.go",
         "android_app_conversion_test.go",
         "apex_conversion_test.go",