Arm backend: Add evaluate_model.py (pytorch#18199)

Arm backend: Add evaluate_model.py
    
This patch reimplements the evaluation feature that used to be in
aot_arm_compiler.py while introducing a few improvements. The program is
evaluate_model.py and it imports functions from aot_arm_compiler.py to
compile a model in a similar manner, but runs its own code that is
focused on evaluating a model using the evaluators classes in
backends/arm/util/arm_model_evaluator.py.

The following is supported in evaluate_model.py:
- TOSA reference models (INT, FP).
- Evaluating a model that is quantized and/or lowered.
  I.e., it is possible to evaluate a model that is quantized but not
  lowered, lowered but not quantized, or both at the same time.
- The program can cast the model with the --dtype flag to evaluate a
  model in e.g., bf16 or fp16 format.

Also add tests that exercise evaluate_model.py with different command
line arguments.

Author: martinlsm

backends/arm/scripts/aot_arm_compiler.py

@@ -691,7 +691,7 @@ def _get_args():
     if args.evaluate is not None or args.evaluate_config is not None:
         logging.error(
             "Model evaluation is no longer supported in this script."
-            " Ignore and continue."
+            " Use evaluate_model.py instead. Ignore and continue."
         )
 
     return args