* [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
* remove trailing space in cpprest, update samples
* add android batch files, better code format, sync petstore.json with
petstore.yaml
* restore petstore.json and sync it to petstore.yaml
* update circleci pom.xml
* add new android files
* add new android files