[WIP] PR: Print frames deadlock

[impact27]

Description of Changes

This allows printing the current frames even in case of a deadlock.

For example, run:

from qtpy.QtCore import QMutex
lock = QMutex()
lock.lock()
lock.lock()

This creates a deadlock in c code. Pressing ctrl + c won't help you. This can give helpful insight to debug the issue.

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)
• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

(kind of) Fixes #1613

Affirmation

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I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: impact27

[impact27]

this helps mitigate ipython/ipykernel#449

[impact27]

I have added [WIP] because this needs a way of filtering out spyder code from the frames.

[impact27]

I am not sure this is going to be for Spyder 4. I think we should keep this for spyder 5

[impact27]

replaced by #11186