Support using OpenCL with Android API Level 33

[asus4]

• Closes Running Android GPUDelegate in BG thread fails on API Level 31 #263
• Supported Unity Editor is 2022 LTS
• Change Android API Level to 33, which is required to submit the app to Google Play Store

Unity 2022 uses Gradle 7.1.2. Which means we don't need a hack to use OpenCL anymore. Just adding the following tags in the custom AndroidManifest.xml would work 👍

<uses-native-library android:name="libOpenCL.so" android:required="false"/>
<uses-native-library android:name="libOpenCL-car.so" android:required="false"/>
<uses-native-library android:name="libOpenCL-pixel.so" android:required="false"/>