Support redis[s]:// URI scheme and deprecate legacy URIs

[clue]

This project now supports standard redis:// and rediss:// URI schemes:

$factory->createClient('redis://:secret@localhost:6379/4');
$factory->createClient('redis://localhost:6379?password=secret&db=4');

See also https://www.iana.org/assignments/uri-schemes/prov/redis and https://www.iana.org/assignments/uri-schemes/prov/rediss
Resolves / closes #40
Supersedes / closes #42