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

Medium Risk
Adds timing/timeout behavior to the core MockVWS request interception by patching a private responses hook and using thread-local timeout capture, which could be brittle across library versions and affect test determinism.

Overview
Adds an optional response_delay_seconds parameter to MockVWS to artificially delay mocked VWS/VWQ responses and surface requests.exceptions.Timeout when the delay exceeds the caller’s timeout (including tuple connect/read timeouts).

Implements delay by wrapping each responses callback and patching responses.RequestsMock._on_request to capture the request’s timeout in thread-local storage; updates tests to cover default no-delay, timeout, success-with-delay, and tuple-timeout behavior, and adjusts pyproject.toml vulture ignores for new TYPE_CHECKING-only names.

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