[PyTorch][Edge] Adding tests for lite quantized models (#60226)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60226
# Context
Read this posts for details about why we need a test bench for quantized lite modules
https://fb.workplace.com/groups/2322282031156145/permalink/4289792691071726/
# This Diff
Adds test cases for Quantized Lite modules
ghstack-source-id: 131859101
Test Plan:
```
[ ~/fbsource/fbcode] buck test caffe2/test:mobile -- mobile.test_lite_script_module.TestLiteScriptQuantizedModule
Unable to connect to Buck daemon, restarting it...
Running with tpx session id: 44cf0b2f-0905-444a-95df-4a2eec774163
Trace available for this run at /tmp/tpx-20210618-093849.343917/trace.log
Started reporting to test run: https://www.internalfb.com/intern/testinfra/testrun/7036874461151326
✓ ListingSuccess: caffe2/test:mobile - main (16.736)
✓ Pass: caffe2/test:mobile - test_two_layer (mobile.test_lite_script_module.TestLiteScriptQuantizedModule) (14.836)
✓ Pass: caffe2/test:mobile - test_annotated_nested (mobile.test_lite_script_module.TestLiteScriptQuantizedModule) (15.073)
✓ Pass: caffe2/test:mobile - test_quantization_example (mobile.test_lite_script_module.TestLiteScriptQuantizedModule) (16.286)
✓ Pass: caffe2/test:mobile - test_single_layer (mobile.test_lite_script_module.TestLiteScriptQuantizedModule) (18.360)
Summary
Pass: 4
ListingSuccess: 1
```
https://www.internalfb.com/intern/testinfra/testconsole/testrun/7036874461151326/
Reviewed By: iseeyuan
Differential Revision: D29212232
fbshipit-source-id: 8d0b61b3f414e31720f1e3ce681ec8fa716555c1
