compliance package for license metadata: dumpgraph

package to read, consume, and analyze license metadata and dependency
graph.

Includes testdata/ and the the below command-line tool:

dumpgraph outputs edges of the graph as "target dependency annotations"

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all
Test: m systemlicense
Test: m dumpgraph; out/soong/host/linux-x86/dumpgraph ...

where ... is the path to the .meta_lic file for the system image. In my
case if

$ export PRODUCT=$(realpath $ANDROID_PRODUCT_OUT --relative-to=$PWD)

... can be expressed as:

${PRODUCT}/gen/META/lic_intermediates/${PRODUCT}/system.img.meta_lic

Change-Id: I5fe57d361da5155dbcb2c0d369626e9200c9d664
diff --git a/tools/compliance/Android.bp b/tools/compliance/Android.bp
index e56a471..1853e83 100644
--- a/tools/compliance/Android.bp
+++ b/tools/compliance/Android.bp
@@ -17,6 +17,13 @@
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+blueprint_go_binary {
+    name: "dumpgraph",
+    srcs: ["cmd/dumpgraph.go"],
+    deps: ["compliance-module"],
+    testSrcs: ["cmd/dumpgraph_test.go"],
+}
+
 bootstrap_go_package {
     name: "compliance-module",
     srcs: [