feat: support rdb persistence

[xgzlucario]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.21519% with 72 lines in your changes missing coverage. Please review.

Project coverage is 81.07%. Comparing base (4971cae) to head (5dd213c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
rdb.go	54.20%	33 Missing and 16 partials ⚠️
command.go	87.50%	12 Missing and 3 partials ⚠️
rotom.go	83.87%	3 Missing and 2 partials ⚠️
aof.go	91.42%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   83.31%   81.07%   -2.25%     
==========================================
  Files           9       10       +1     
  Lines         983     1115     +132     
==========================================
+ Hits          819      904      +85     
- Misses        128      159      +31     
- Partials       36       52      +16     

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