* [android] Fix useAndroidMavenGradlePlugin type in template
* [android][volley] Use version variables in template
* [android][volley] Exclude httpclient
As it is incompatible with Android
* [android][volley] Resolve file conflict between httpcomponents modules
* [android] Update Gradle, the plugins, build tools
This fixes building with current Android Studio.
Android Gradle plugin version 8.0.0 was chosen for wider compatibility
with Android Studio versions (as far back as 2022.2.1).
The Maven plugin has been abandoned since the functionality is now
built in, and manual jar tasks are not necessary with it.
* [android] Regenerate samples
