Add android test app to validate Java API for ORT-Mobile Android (#7477)
* test
* [gwang] make cmake compile work
* [gwang] enble build apks
* some build update
* add simple sigmoid test android project and cmake
* add build.py
* refine and remove unused import lib
* address CR comments
* remove unnecessary files
* add README.md
* minor update
* remove
* minor change
* fix ci failure and minor update
* fix typo in project folder
* remove
* remove and minor update
* refine
* minor fix
* fix
* fix typo
* add gradle spotlessApply task to fix CI failure
* fix
* enable spotlessApply in build gradle
* revert some changes
* minor fix
* run spotless apply for format
* address CR comments and fix CI version and format
* refine
* Refine
* address comments
* refine
* refine
* modify
* reformat
* resolve version conflicts
* minor update
* minor update
* address comments
* minor update
Co-authored-by: Guoyu Wang <wanggy@outlook.com>