feat: support aten::format evaluator

[ruoqianguo]

Signed-off-by: Ruoqian Guo [email protected]

Description

Support aten::format(str self, ...) -> (str)

Fixes #718

Type of change

Please delete options that are not relevant and/or add your own.

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes

[ruoqianguo]

Add a unit test which tests aten::format in conjunction with raised exception.

[narendasan]

LGMT