Add timeout debug verbose like those in dcp-timer.js which we are replacing, like we do in xhr

[philippedistributive]

Issue type

Bug

How did you install PythonMonkey?

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OS platform and distribution

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Python version (python --version)

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PythonMonkey version (pip show pythonmonkey)

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Bug Description

Now that we will use our own setTimeout calls etc and not the ones from dcp-timers, reproduce the debug facility in timers.js

See
https://gitlab.com/Distributed-Compute-Protocol/dcp/-/blob/wes/DCP-4054/make-dcp-client-grok-pythonmonkey/src/common/dcp-timers.js?ref_type=heads#L61

and

https://gitlab.com/Distributed-Compute-Protocol/dcp/-/merge_requests/2669/diffs#621b29c83d193f259581eb1b3fd1187d377684ba_55_54

Also add a debug flag to dcp-timers the likes of
debugging('backoff')
so that they are not always on and are turned on selectively

Standalone code to reproduce the issue

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Relevant log output or backtrace

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Additional info if applicable

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What branch of PythonMonkey were you developing on? (If applicable)

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[Xmader]

See #351 (comment)