Added GEORADIUS(BYMEMBER)_RO variants for read-only operations.
Issue #4084 shows how for a design error, GEORADIUS is a write command because of the STORE option. Because of this it does not work on readonly slaves, gets redirected to masters in Redis Cluster even when the connection is in READONLY mode and so forth. To break backward compatibility at this stage, with Redis 4.0 to be in advanced RC state, is problematic for the user base. The API can be fixed into the unstable branch soon if we'll decide to do so in order to be more consistent, and reease Redis 5.0 with this incompatibility in the future. This is still unclear. However, the ability to scale GEO queries in slaves easily is too important so this commit adds two read-only variants to the GEORADIUS and GEORADIUSBYMEMBER command: GEORADIUS_RO and GEORADIUSBYMEMBER_RO. The commands are exactly as the original commands, but they do not accept the STORE and STOREDIST options.
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