Support for TYPE parameter of SCAN command

[Jamby93]

As of #1559 (for Lettuce) and #2564 (for Jedis) TYPE parameter in SCAN commands is supported by both clients.
Lettuce supports it with KeyScanArgs while Jedis simply added an additional parameter to their scan commands.
ScanOptions currently does not offer the type field and I couldn't find a way to perform this type of SCAN without directly accessing the underneath repositories.