feat: Add option to control deserialization when watching events

[Kevinz857]

What type of PR is this?

/kind feature
/kind optimization

What this PR does / why we need it

This PR adds an option to disable automatic deserialization in the Watch.stream() method. When watching large volumes of resource updates, the default deserialization of every event can cause significant latency overhead and potential processing delays.

By allowing clients to opt-out of automatic deserialization when only basic JSON parsing is needed, we can significantly reduce time cost and improve event processing throughput. This is particularly important in scenarios with high event volumes or resource constraints, where the overhead of deserializing every object into full model instances becomes a bottleneck.

Key changes

• Added a deserialize parameter to Watch.stream() method (defaults to True for backward compatibility)
• When deserialize=False, events are only JSON parsed without model conversion
• Maintains the original behavior when deserialize=True
• Added test cases to verify both behaviors

Special notes for your reviewer

This change is backward compatible with existing code as it defaults to the current behavior (deserialize=True). Users can specifically opt-in to the performance optimization by setting deserialize=False when needed.

Does this PR introduce a user-facing change?

Add option to disable automatic deserialization in the Watch.stream() method to improve performance in high-volume watching scenarios

[k8s-ci-robot]

@Kevinz857: The label(s) kind/optimization cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind feature
/kind optimization

What this PR does / why we need it

This PR adds an option to disable automatic deserialization in the Watch.stream() method. When watching large volumes of resource updates, the default deserialization of every event can cause significant latency overhead and potential processing delays.

By allowing clients to opt-out of automatic deserialization when only basic JSON parsing is needed, we can significantly reduce time cost and improve event processing throughput. This is particularly important in scenarios with high event volumes or resource constraints, where the overhead of deserializing every object into full model instances becomes a bottleneck.

Key changes

• Added a deserialize parameter to Watch.stream() method (defaults to True for backward compatibility)
• When deserialize=False, events are only JSON parsed without model conversion
• Maintains the original behavior when deserialize=True
• Added test cases to verify both behaviors

Special notes for your reviewer

This change is backward compatible with existing code as it defaults to the current behavior (deserialize=True). Users can specifically opt-in to the performance optimization by setting deserialize=False when needed.

Does this PR introduce a user-facing change?

Add option to disable automatic deserialization in the Watch.stream() method to improve performance in high-volume watching scenarios

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Kevinz857
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[roycaihw]

/assign