feat: check rule before creating it

[Yisaer]

1. check rule before creating it
2. fix redisSub conf

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 81.48148% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 64.00%. Comparing base (ea60779) to head (6ce7bab). Report is 10 commits behind head on master.

Files	Patch %	Lines
internal/topo/planner/planner.go	66.67%	2 Missing and 1 partial :warning:
internal/server/rule_manager.go	71.43%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2624      +/-   ##
==========================================
+ Coverage   63.99%   64.00%   +0.01%     
==========================================
  Files         330      330              
  Lines       38327    38417      +90     
==========================================
+ Hits        24524    24587      +63     
- Misses      11637    11659      +22     
- Partials     2166     2171       +5     

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