Add support for a Protocol generic classes

[akhundMurad]

Merge request fixes the issue: #31

[RobertoPrevato]

@akhundMurad
thank you for your contribution, but Protocol is already supported. The problem is another one, that Protocol without __init__ method defined generates a catch-all constructor (__init__(*args, **kwargs)). I still want rodi to raise exception for such constructors because they are ambiguous for a DI container.

Please read my two comments here:

#31 (comment)

#31 (comment)