[Feature] end-to-end test with CrossWOZ

[nuance1979]

Describe the feature
I was able to run python tests/test_BERTNLU-RuleDST-RulePolicy-TemplateNLG.py and got the same results as in README. Thanks a lot!

However, as soon as I tried to run the same test for CrossWOZ, I ran into the issue that there was no evaluator for CrossWOZ dataset. In fact, currently analyzer only works with the default MultiWOZ evaluator.

I tried to use MultiWOZ evaluator but it didn't work. I looked at CrossWOZ repo but it seemed there wasn't an end-to-end evaluator class, either.

Expected behavior
A working end-to-end evaluator for CrossWOZ dataset.

Additional context
n/a

[zqwerty]

Yes, we will add it in the future