support for hash field expiration

[atakavci]

Closes/Fixes #2715

this PR add support for a set of new commands related to expiration of individual members of hash

HashFieldExpire exposes the functionality of commands HPEXPIRE/HPEXPIREAT, for each specified field, it gets the value and sets the field's remaining time to live or expireation timestamp

HashFieldExpireTime exposes the functionality of command HPEXPIRETIME, for specified field, it gets the remaining time to live in milliseconds or expiration timestamp

HashFieldPersist exposes the functionality of command HPERSIST, for each specified field, it removes the expiration time

HashFieldTimeToLive expoes the functionality of command HPTTL, for specified field, it gets the remaining time to live in milliseconds or expiration timestamp