feat(#4): collect all errors

[KyleKing]

Fixes #4

Adds feature and tests for printing multiple errors are once

> python tests/multiple_incorrect_methods_test.py
Traceback (most recent call last):
  File "/Users/kyleking/Developer/Pull_Requests/abcmeta/tests/multiple_incorrect_methods_test.py", line 27, in <module>
    class ABCDerived(ABCParent):
  File "/Users/kyleking/.asdf/installs/python/3.10.5/lib/python3.10/abc.py", line 106, in __new__
    cls = super().__new__(mcls, name, bases, namespace, **kwargs)
  File "/Users/kyleking/.asdf/installs/python/3.10.5/lib/python3.10/site-packages/abcmeta/__init__.py", line 192, in __init_subclass__
    raise AttributeError("\n\n".join(errors))
AttributeError: Derived class 'ABCDerived' has not implemented 'method_1' method of the parent class 'ABCParent'.

Signature of the derived method is not the same as parent class:
- method_2(self, name: str, age: int) -> Dict[str, str]
?                      ^ -

+ method_2(self, name: int, age: int) -> Dict[str, str]
?                      ^^

Derived method expected to get 'name:<class 'str'>' paramter's type, but gets 'name:<class 'int'>'

Signature of the derived method is not the same as parent class:
- method_4(self, name: str, age: int) -> Tuple[str, str]
?                ^  ^

+ method_4(self, family: str, age: int) -> Tuple[str, str]
?                ^  ^^^

Derived method expected to get 'name' paramter, but gets 'family'

Only downside is that maybe the join on 2x \n could be more clear. Should it be something involving dashes like '-' * 80 or 3x \n?

[mortymacs]

Thanks!
You're PR is very good. Do you mind if I add a commit to your PR? I just wanna add one more method to the new test file and also rename the new test file into the incorrect_multiple_methods_test.py.

[KyleKing]

Yeah, no problem! Feel free to make any changes and merge when you're happy with it

[mortymacs]

Let's merge your PR and then I'll send a separate PR as it will contain the error number.