HyperLogLog

[absolute8511]

support HLL with pfadd and pfcount, current not available for merge since it may across multi partitions.
#6

[codecov]

Codecov Report

Merging #30 into master will increase coverage by 0.22%.
The diff coverage is 74.14%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   47.65%   47.87%   +0.22%     
==========================================
  Files         103      104       +1     
  Lines       17110    17259     +149     
==========================================
+ Hits         8154     8263     +109     
- Misses       7629     7651      +22     
- Partials     1327     1345      +18

Impacted Files	Coverage Δ
node/config.go	100% <ø> (ø)	⬆️
rockredis/t_ttl.go	76.52% <100%> (ø)	⬆️
node/node_cmd_reg.go	100% <100%> (ø)	⬆️
rockredis/rockredis.go	32.44% <100%> (+0.15%)	⬆️
server/server.go	46.75% <100%> (+0.23%)	⬆️
node/namespace.go	37.71% <100%> (+0.17%)	⬆️
node/raft.go	40.44% <66.66%> (+0.15%)	⬆️
rockredis/t_hll.go	71.42% <71.42%> (ø)
node/keys.go	80% <75%> (-1.25%)	⬇️
node/ttl.go	35.15% <0%> (-0.79%)	⬇️
... and 2 more

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