[jdbc-v2] Metabase testing issues

[Paultagoras]

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1. TABLE_TYPES should be broad categories rather than table engines
2. SQL Comments cause issues parsing statement type
3. Unwrap not unwrapping
4. ResultSet.next() throws exception other than SQLException
5. SimpleAggregateFunction not supported (See Add SimpleAggregateFunction support #2022)
6. IPv6 is showing as IPv4
7. Set no-op for all instances of "Unsupported"
8. Enums should return String not Number