Add a way to pass pgoptions when establishing the connection

[mderoy]

Add code for passing pgoptions when establishing a database connection

Testing:

• Tried to do testing with python2, but there seems to be sytax errors unrelated to my changes
• Tested with python3...one failed test, but seems unrelated 'FAILED test_typeconversion.py::test_xml_roundtrip - nzpy.core.ProgrammingError: ERROR: Function 'XMLPARSE(UNKNOWN)' does not exist'
• Used interactive python shell to ensure that my pgoption was passed, and the effect was correctly taken by the database

[aniket-s-kulkarni]

@mderoy can we change pgOptions to accept enums rather than free form. That way caller doesn't need to know about engine internals.

[mderoy]

@mderoy can we change pgOptions to accept enums rather than free form. That way caller doesn't need to know about engine internals.

The intention was to keep it opaque...adding enums for this would publicly document things most users have no business setting. (after reviewing the options that can be passed I don't see why a user would ever set any of these)

[mderoy]

@shabbir10july I've left it undocumented in our README....do you think we should document it as 'for internal use only' or just leave undocumented? (me and aniket aren't sure)

[mderoy]

forgot to push init.py changes.... should be there now.

[aniket-s-kulkarni]

👍