Run the Finder and make its results available to Kati

The Finder runs roughly 200ms faster than findleaves.py in aosp,
and runs roughly 400ms faster in internal master.

Bug: 64363847
Test: m -j

Change-Id: I62db8dacc90871e913576fe2443021fb1749a483

ui/build/Android.bp

@@ -19,6 +19,7 @@ bootstrap_go_package {
         "soong-ui-logger",
         "soong-ui-tracer",
         "soong-shared",
+        "soong-finder",
     ],
     srcs: [
         "build.go",
@@ -27,6 +28,7 @@ bootstrap_go_package {
         "context.go",
         "environment.go",
         "exec.go",
+        "finder.go",
         "kati.go",
         "make.go",
         "ninja.go",