Add atol and rtol as args for verify_result_with_bundled_expected_output (#1209)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1209

Update the bundled output verification python bindings to allow passing the
rtol and atol tolerances. This allows a test to configure what threshold of error is
acceptable in comparing outputs.

Also update the pybindings.pyi to reflect arguments available for bundled programs
in multiple functions.

Reviewed By: Gasoonjia

Differential Revision: D51218906

fbshipit-source-id: 30c74ae4c3691885b003b7ec57408cc4974332fb