Add new script for metadata build target

#/bin/bash

# Copyright 2024, The Android Open Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#     http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

set -ex

export TARGET_PRODUCT=aosp_arm64

export TARGET_RELEASE=trunk_staging

export TARGET_BUILD_VARIANT=eng

build/soong/bin/m dist \

    code_metadata