Adding model stats to aot_arm_compiler (#5816)

Summary:
* Adds GenericModelEvaluator, which gathers metrics applicable to all models
* Adds --evaluate option to enable gathering quantization metrics

Signed-off-by: Tom Allsop <tom.allsop@arm.com>

Change-Id: Ia9b591841f188870fa5e62d0568169498301393d

Pull Request resolved: https://github.com/pytorch/executorch/pull/5816

Reviewed By: mergennachin

Differential Revision: D64047185

Pulled By: digantdesai

fbshipit-source-id: b443b616e9092ee5c39ce9ec07bd0c0ef2aca04a