List and tuple different types

[silentsokolov]

List -> Array and Tuple -> Tuple like psycopg2.

[coveralls]

Coverage increased (+0.004%) to 95.526% when pulling c99b1b1 on silentsokolov:feat-tuple into a3a2651 on mymarilyn:master.

[xzkostyan]

Hi.

Cool, but it's partial tuple support.

Query SELECT (1, 2) will fail on types parsing. For full tuple support we need to implement TupleColumn like ArrayColumn.

Yup, it's a little bit complicated. I haven't take a deep look into Tuple's internals in CH yet.

Anyway, I can merge this PR as is later.