[CORE-0.3] Remove `@dc.dataclass` wrappers everywhere

[blythed]

Currently, everytime a user wants to create his/her own Component, he has to additionally wrap with @dc.dataclass. This is unnecessary overhead and should be removed as a requirement.

Should be possible with something like this:

import dataclasses as dc

class AutoDataclassMeta(type):
    def __new__(cls, name, bases, dct):
        # Automatically applies the dataclass decorator to the new class
        new_cls = super().__new__(cls, name, bases, dct)
        new_cls = dc.dataclass(kw_only=True)(new_cls)
        return new_cls

class Component(metaclass=AutoDataclassMeta):
    # Now every subclass of Component will automatically be a keyword-only dataclass
    pass

class MyComponent(Component):
    some_field: int
    another_field: str = "default"

# When you instantiate MyComponent, it behaves as a dataclass with keyword-only arguments
comp = MyComponent(some_field=10, another_field='example')

[jieguangzhou]

BTW, If we use metaclass, we can also add @ensure_initialized to predict and predict_one