Fake Redis endpoint speaking RESP (the Redis serialization protocol).
Bucketless, so it uses the bucketless side of FakeRiak.SimpleStore.
Supported commands: PING, ECHO, SET, GET, DEL, EXISTS, COMMAND, SELECT, QUIT.
Extra SET options (NX, XX, EX, ...) are accepted but ignored — SET always
stores and replies +OK.
Requests are parsed as RESP arrays of bulk strings (what real clients such as
redis-cli send); simple inline commands (LF- or CRLF-terminated) are also
accepted. Malformed RESP gets an error reply and the connection is closed.