Add response_delay_seconds parameter for testing timeouts

[adamtheturtle]

Summary

Adds response_delay_seconds parameter to MockVWS to simulate slow HTTP responses, enabling testing of request timeout handling. When the delay exceeds a client's timeout, requests.exceptions.Timeout is raised naturally.

Test plan

• 5 new tests covering timeout behavior with raw requests and VWS client
• All existing tests continue to pass

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Note

Low Risk
Adds an opt-in delay wrapper around mock callbacks plus new tests; no production networking or security logic is changed.

Overview
MockVWS now accepts a response_delay_seconds parameter that delays every mocked VWS/VWQ response, and simulates client-side timeouts by inspecting the request’s timeout (including (connect, read) tuples) and raising requests.exceptions.Timeout when the delay exceeds the effective read timeout.

Adds focused tests validating the default no-delay behavior and timeout/non-timeout outcomes, and documents the new parameter in CHANGELOG.rst.

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