aconfig: create unit test targets for aconfig_protos and
aconfig_storage_file crate

also added a bunch of comments to satisfy android lint requirements

Bug: b/321077378
Test: atest aconfig.test, atest aconfig_protos.test, atest aconfig_storage_files.test
Change-Id: I9bce302ac3bc98c5347e5334d915e77337ee89c4
diff --git a/tools/aconfig/aconfig_protos/Android.bp b/tools/aconfig/aconfig_protos/Android.bp
index 1cc4e41..18c545a 100644
--- a/tools/aconfig/aconfig_protos/Android.bp
+++ b/tools/aconfig/aconfig_protos/Android.bp
@@ -45,12 +45,12 @@
     host_supported: true,
 }
 
-rust_library {
-    name: "libaconfig_protos",
+rust_defaults {
+    name: "aconfig_protos.defaults",
+    edition: "2021",
+    clippy_lints: "android",
+    lints: "android",
     srcs: ["src/lib.rs"],
-    crate_name: "aconfig_protos",
-    host_supported: true,
-    lints: "none",
     rustlibs: [
         "libaconfig_rust_proto",
         "libanyhow",
@@ -60,3 +60,16 @@
         "libpaste",
     ]
 }
+
+rust_library {
+    name: "libaconfig_protos",
+    crate_name: "aconfig_protos",
+    host_supported: true,
+    defaults: ["aconfig_protos.defaults"],
+}
+
+rust_test_host {
+    name: "aconfig_protos.test",
+    test_suites: ["general-tests"],
+    defaults: ["aconfig_protos.defaults"],
+}