Add sh_binary support to bp2build converter.

Test: Added a unit test in this CL.
Change-Id: I6e9b3c833a257414daf82e603b733e459535d206
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 2bbe4b5..54fc93f 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -12,6 +12,7 @@
         "soong-android",
         "soong-bazel",
         "soong-genrule",
+        "soong-sh",
     ],
     testSrcs: [
         "build_conversion_test.go",