Fix default audio interface should_stop attribute

[AngeloGiacco]

Initialize should_stop and related resources in __init__ and add robustness checks to stop() methods to prevent AttributeError.

The should_stop attribute and other resources (like output_thread, in_stream, out_stream, p) were only initialized in the start() method. If stop() was called before start(), it would result in an AttributeError. This PR ensures these attributes are always present and safely handled, preventing crashes in scenarios like conversation.end_session() being called without a prior start().

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[AngeloGiacco]

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