Implementing the use of TrainingDataImporter in rasa test

[Imod7]

Implementing the 2nd Part of the changes described in Issue 5986 related to run_evaluation.
The current PR is a continuation of this one #7539 - in the 7539 I had issues with the CLA certificate and then squash and rebase became very difficult because of merged commits so I decided to create a new one, the current one.

Proposed changes:

• Loading test data using TrainingDataImporter in run_evaluation function.
• Changed the Optional parameters in load_from_dict of TrainingDataImporter to make it work with the data we have in run_evaluation.
• Instead of having 1 function, the run_nlu_test now we have 2 functions described below :
  1. run_nlu_test that runs run_nlu_test_async in the event loop.
  2. run_nlu_test_async
• Passing directly the specific arguments to run_nlu_test_async instead of argparse.Namespace thus making it more reusable.
• Made async the following functions :
  1. run_evaluation
  2. compare_nlu
  3. test_nlu
  4. compare_nlu_models
  5. train_nlu_async
  6. test_nlu_comparison
• Making train_nlu_async function public so we can call it from other modules.

[wochinge]

Great iteration! 💯 Left a few comments

[wochinge]

@Imod7 I don't understand this part in your proposed changes, what do you mean?

Making async a list of functions and then adding the corresponding await statements when they are called.

[wochinge]

Wuhuu, we're nearly there 💯 Awesome work with disentangling all the async things 🚀

[Imod7]

I think I did all the last changes that you mentioned and I also removed Optional from these parameters in run_nlu_test_async :

data_path: Text,
models_path: Text,
output_dir: Text,
no_errors: bool,

because as you showed yesterday I checked the functions related to set_test_nlu_arguments and :

• in add_nlu_data_param it adds default nlu/data path data
• in add_model_param it adds the default models path/directory models
• in add_test_nlu_argument_group it sets the default output directory results
• in add_errors_success_params it sets default no_errors False

Changed the docstring again of run_nlu_test_async and run_nlu_test.
Squashed and rebased the last commit.

[wochinge]

Two more comments. Can you please also update the pull request description and convert your PR from a draft to a actual pull request?

[wochinge]

Just re-request review once you're done and I have a final look + approve 🎉

[wochinge]

Congrats to your first Rasa Open Source change 🚀

Two notes:

• It's (in my opinion) ok to stay a little bit more high level in your pull request description. I can see the details in the code. In my opinion it's more important to explain why certain things where changed (e.g. why did did you have to make things async). No need to change anything in this PR, rather a suggestion for the future).
• Either add the label ready-to-merge to the PR so that the PR is automatically merged or press the green merge button yourself once all checks passed 🎉 (which I recommend for your first PR as pressing a button is way more fun and satisfying 😄 )