[PR ](https://github.com/redis/redis/pull/14826) introduced a new rate
limiting command which stores its internal implementation-detail data
into a string key.
Since this will prevent a client from detecting type errors or
accidental overwrites or value invalidations, f.e via SET or INCR this
PR introduces a new data type - OBJ_GCRA specifically created for that
new command.
Furthermore, a new RATE_LIMIT KSN type was introduced for emitting "gcra" events on such keys.
GCRASETTAT was renamed to GCRASETVALUE.
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Co-authored-by: debing.sun <debing.sun@redis.com>