feat: add SORT_RO command

[emilienkofman]

Add support for sort read only command, as suggested in discussion #2352 (comment)

[emilienkofman]

For the record I've ran make test and found a few tests failing, not sure if it's related to my modifications or something not properly setup:

Summarizing 5 Failures:

[Fail] withConn [It] should replace the connection in the pool when there is no error 
/home/ekofman/Workspace/src/github.com/emilienkofman/redis/internal_test.go:324

[Fail] withConn [It] should replace the connection in the pool when there is an error not related to a bad connection 
/home/ekofman/Workspace/src/github.com/emilienkofman/redis/internal_test.go:337

[Fail] withConn [It] should remove the connection from the pool when it times out 
/home/ekofman/Workspace/src/github.com/emilienkofman/redis/internal_test.go:350

[Fail] Sentinel [It] should facilitate failover 
/home/ekofman/Workspace/src/github.com/emilienkofman/redis/sentinel_test.go:95

[Fail] Sentinel [BeforeEach] supports DB selection 
/home/ekofman/Workspace/src/github.com/emilienkofman/redis/sentinel_test.go:26

Ran 529 of 533 Specs in 88.188 seconds
FAIL! -- 524 Passed | 5 Failed | 2 Pending | 2 Skipped

[monkey92t]

good, Go / build (1.19.x) (pull_request) this error looks like a network unexpected error, we ignore it.