Add support for complex intermediate return types in fake method

[ST-DDT]

Clear and concise description of the problem

Currently it is not possible to use methods, that return complex objects in the fake method, because it will only display [object].

Suggested solution

Add support for the following syntax:

faker.helpers.fake('{{airline.airport.code}}')

Which should be equivalent to:

faker.airline.airport().code

This should work for both method references and locale data references.

Alternative

No response

Additional context

Ref: #1733 (comment)

[ghost]

I would like to work on this issue.

[ST-DDT]

Awesome. Thanks for your help.

[ST-DDT]

@inkedtree Could you please give us an update on the progress here?

[ghost]

@ST-DDT To be honest, there is not much progress so far. Last time I worked on this issue, I thought about where I need to make changes in the code. In the last few weeks I was quite busy. I will try to make a PR this week, if that is okay for you.