identify possible cx_oracle issue oracle RETURNING with varchars

this might be an oracle limitation, cx_oracle bug, not sure. See the tests which were marked as failing in ee8eea4101d4e12aa7db84c9a6a289cd6f9e3107 , test_returning/test_anon_expressions, test_returning/test_column_targeting .

the work here is to distill what the tests do into a straight cx_oracle script, i.e. a RETURNING statement with a few out parameters, then see what we get back. Then report on the cx_oracle list if behavior is not what's expected. if Anthony Tuniga says "can't fix", add that as a comment to these tests and the dialect documentation.

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