gh-68272: add sub-millisecond display in pstats

[romuald]

When running pstats with functions that take less than 0.5 millisecond
(per call for example), the value shown is '0.000, which isn't really
helpful.

This patch aims to show the value in microseconds instead of seconds for
values that would otherwise be displayed as '0.000'

https://bugs.python.org/issue24084

• Issue: pstats: sub-millisecond display #68272

[the-knights-who-say-ni]

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[romuald]

(Note that I have only tested this patch against the 3.6 branch, as I can't currently compile the master branch on my development machine)

[romuald]

(added my github account to my bpo account just now)

[guillochon]

Any update here? Would make pstats a bit more useful...

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[arhadthedev]

Closing as per #68272 (comment).