Bitfield_RO support

[akash14darshan]

Bitfield read only is very useful for targeting only read only nodes, since BitField is considered a write command by default.
https://redis.io/commands/bitfield_ro/

[chayim]

While useful with read only cluster nodes - it's a generally good idea, as via an acl, specific users can be granted readonly access (say bitfield_ro and get). IMHO it's missing @ofekshenawa