Launcher3: Introduce lint checks for Launcher3.

  As part of the initial check in, add a test to ensure
  that custom Dialogs are not utilized inside of the codebase.

Bug: 389709580
Test: DialogDetectorTest
Flag: NONE Lint checks
Change-Id: I7e3f98c729cdbf4d062419c53a209d12a23b1806
diff --git a/Android.bp b/Android.bp
index 5b986ab..1e1e0ad 100644
--- a/Android.bp
+++ b/Android.bp
@@ -452,6 +452,7 @@
         "AndroidManifest-common.xml",
     ],
     lint: {
+        extra_check_modules: ["Launcher3LintChecker"],
         baseline_filename: "lint-baseline.xml",
     },
 }