[issue14673] add sys.implementation

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

sorry, I should have been more clear.  issue14673_full.diff is not simply a merging of the two previous patches, but rather their merger, plus SimpleNamespace, plus removing the "public" restriction from the repr.  I may have a small tweak or two as well.

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