feat(darknet): support config reload

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Pull request overview

This PR adds config reload support to the darknet object detection component, enabling the component to be cleanly unloaded and re-loaded at runtime when the configuration changes.

Changes:

• Adds an unload() top-level function to gracefully stop the darknet worker and remove it from vis.data
• Adds an abstract stop() method to BaseDarknet with concrete implementations in DarknetDNN (delegating to SubProcessWorker.stop) and DarknetNative (delegating to ChildProcessWorker.stop)
• Moves numpy and Viseron imports under TYPE_CHECKING guard, and adds type annotations to several abstract and concrete methods

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[Copilot]

The BaseDarknet.preprocess abstract method's frame parameter now has a np.ndarray type annotation, and DarknetDNN.preprocess was also updated in this PR. However, DarknetNative.preprocess at line 447 still has an untyped frame parameter (def preprocess(self, frame) -> bytes:). This PR introduced the type annotation to the base class and one subclass, but missed updating DarknetNative.preprocess to be consistent.

Suggested change

	def preprocess(self, frame: np.ndarray) -> np.ndarray | bytes:
	def preprocess(self, frame: Any) -> np.ndarray | bytes: