Nightly dimension, input shape in gradle (#30195)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30195
1. Added flavorDimensions 'build' local/nightly
to be able to test the latest nightlies
```
cls && gradle clean test_app:installMobNet2QuantNightlyDebug -PABI_FILTERS=x86 --refresh-dependencies && adb shell am start -n org.pytorch.testapp.mobNet2Quant/org.pytorch.testapp.MainActivity
```
2. To be able to change all new model setup editing only `test_app/build.gradle`
Inlined model asset file names to `build.gradle`
Extracted input tensor shape to `build.gradle` (BuildConfig)
Test Plan: Imported from OSS
Differential Revision: D18893394
Pulled By: IvanKobzarev
fbshipit-source-id: 1fae9989d6f4b02afb42f8e26d0f3261d7ca929b
