[issue22705] Idle extension configuration: add option-help option

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

#27099 (converting built-in extensions to features) made this less important.  But it is still relevant to actual extensions.  There is a dummy extension, zzdummy, for testing.

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stage: needs patch -> patch review
versions: +Python 3.8 -Python 2.7, Python 3.4, Python 3.5

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