[ao][ns] Replacing List[QConfigMapping] in PNP (#86922)
Summary: Added QConfigMultiMapping which is essentially a
List[QConfigMapping] with set methods and dedicated handling to
avoid unwanted matches and improve UX.
note: the from __future__ import annotations line caused weird errors when the
QConfigMultiMapping class was put in _numeric_suite_fx.py so it was moved.
Test Plan: python test/test_quantization.py TestFxNumericSuiteNShadows
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/86922
Approved by: https://github.com/vkuzo
