Add classes for Inheritance

[PythonFZ]

fix #133

TODOs

• Consider renaming Base and Child
• consider changing Child to a dataclass containing all possible dvc/zn options and also include all of them in the Base
• try making Base.methods some sort of abstractmethod?
• documentation
• docstrings
  - [ ] tests (no idea how to test them yet!) moved to Add Tests for #134 #141
• what about multiple methods

Maybe rename .method to something that can not be mixed up with class methods?

Example

class Node:
    my_method_1 = zn.method()
    my_method_2 = zn.method()

node = Node()
node.my_method_1 = HelloWorld(name="John")
node.my_method_1 = HelloWorld(name="Jane")

This would - remove the inheritance for the parent, naming conventions, abstract method of methods, multiple methods and also one does not keep a dictionary up-to-date because it is not required anymore. It currently requires setting e.g. the outs/deps/... from the child method manually.

using importlib as follows

# SAVE
methods = {
    "module": cls.__class__.__module__,
    "name": cls.__class__.__name__,
    "kwargs": {}

}

for key in inspect.signature(cls.__class__.__init__).parameters:
    if key == "self":
        continue
    if key in ["args", "kwargs"]:
        log.error(f"Can not convert {key}!")
        continue
# LOAD
module = importlib.import_module(methods['module'])
cls = getattr(module, methods['name'])

instance = cls(**methods['kwargs'])

[SamTov]

I think the idea is really nice. I am bit confused or I guess unsure of the mix with both named nodes and the idea of attaching methods. Can you run through what the over all idea is?

[SamTov]

great changes to the project.