Add python_library -> py_library bp2build support

Bug: 196091681
Test: bp2build/python_library_conversion_test.go
Test: build/bazel/ci/mixed_{libc,droid}.sh
Change-Id: Ice87d75533c97fd9c139dc59de09a039e2713a01
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 78e3a74..b1ccc96 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -42,6 +42,7 @@
         "performance_test.go",
         "prebuilt_etc_conversion_test.go",
         "python_binary_conversion_test.go",
+        "python_library_conversion_test.go",
         "sh_conversion_test.go",
         "testing.go",
     ],