Version 3.0.0 changed the way sets and maps are handled in libvalkey-py.
Now, all the sets and dicts were treated as lists, maps being lists of
tuples. This change was done without keeping `valkey-py` in mind. As it
turned out, this way of handling maps is not really applicable to
`valkey-py` because `valkey-py` doesn't know what data type it expects.
Hence, it can't tell whether the returned list should be treated as a
map or left as it is.

This commit partly reverts the behaviour to what it was pre-3.0.0,
leaving maps as dicts all the time. All sets, though, are being treated
as lists now when `convertSetsToLists=True`. While this behaviour
excludes some exotic use cases allowed by RESP like set or array being a
key of a map, it does not affect the consumer library as much, and none
of such exotic use cases are being used in the real world anyway.

Signed-off-by: Mikhail Koviazin <[email protected]>