refactor api
add benchmark to dev deps
add initial benchmark test
add pexpire with reply parser
add brackets
add int_reply to del
add status, data and error reply
add kl type as key list argument
add bulk reply
add bulk reply to keys method
add :undefined to string reply
add str_reply to get
add sts_reply to set
add sts_reply to mset
add blk_reply to mget
add specs for publish and flushall
add else assert to pexpire
add renamenx
add dump
add pexpireat and migrate todo