[quant][refactor tests] Move quantization tests into subfolders (#59007)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59007
Create folders for each test category and move the tests.
Will follow-up with a cleanup of test_quantization.py
Test Plan:
python test/test_quantization.py
Imported from OSS
Reviewed By: HDCharles
Differential Revision: D28718742
fbshipit-source-id: 4c2dbbf36db35d289df9708565b7e88e2381ff04
