magicbot: Inject into component __init__

[auscompgeek]

See #21

A good motivating example could look something like the following:

class Vision:
    def __init__(self, name: str):
        self.camera = PhotonCamera(name)

    def execute(self): ...

class Robot(MagicRobot):
    vision: Vision

    def createObjects(self):
        self.vision_name = 'camera'

Of course, it could also be used like this, to make things less magic:

@dataclass
class Chassis:
    module_a: SwerveModule
    module_b: SwerveModule
    module_c: SwerveModule

    def __post_init__(self): ...

    def execute(self): ...

class Robot(MagicRobot):
    chassis: Chassis

    def createObjects(self):
        self.chassis_module_a = SwerveModule(...)
        self.chassis_module_b = SwerveModule(...)
        self.chassis_module_c = SwerveModule(...)