Add package_resources option to android_aar

Summary: Adds a `package_resources` option to `android_aar` buck rule, that when disabled doesn't include resources (`res/` and `R.txt`) to the AAR.

Reviewed By: TheWisp

Differential Revision: D60514572

fbshipit-source-id: 20c1a2045bd0976b0c0def44ffa2d4883b53e479

android/android.bzl

@@ -68,6 +68,7 @@ extra_attributes = {
         "native_library_merge_glue": attrs.option(attrs.split_transition_dep(cfg = cpu_split_transition), default = None),
         "native_library_merge_linker_args": attrs.option(attrs.dict(key = attrs.string(), value = attrs.list(attrs.arg())), default = None),
         "package_asset_libraries": attrs.bool(default = True),
+        "package_resources": attrs.bool(default = True),
         "resources_root": attrs.option(attrs.string(), default = None),
         "strip_libraries": attrs.default_only(attrs.bool(default = not DISABLE_STRIPPING)),
         "_android_toolchain": toolchains_common.android(),

android/android_aar.bzl

@@ -99,7 +99,7 @@ def android_aar_impl(ctx: AnalysisContext) -> list[Provider]:
     android_toolchain = ctx.attrs._android_toolchain[AndroidToolchainInfo]
     if resource_infos:
         res_dirs = [resource_info.res for resource_info in resource_infos if resource_info.res]
-        if res_dirs:
+        if ctx.attrs.package_resources and res_dirs:
             merged_resource_sources_dir = ctx.actions.declare_output("merged_resource_sources_dir/res", dir = True)
             merge_resource_sources_cmd = cmd_args([
                 android_toolchain.merge_android_resource_sources[RunInfo],