feat: support circuit breaker

[dk-lockdown]

ref: #182

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #228 (900f16e) into dev (606ebc7) will increase coverage by 0.46%.
The diff coverage is 68.38%.

❗ Current head 900f16e differs from pull request most recent head f67a9b5. Consider uploading reports for the commit f67a9b5 to get more accurate results

@@            Coverage Diff             @@
##              dev     #228      +/-   ##
==========================================
+ Coverage   42.69%   43.16%   +0.46%     
==========================================
  Files          82       84       +2     
  Lines        9785     9911     +126     
==========================================
+ Hits         4178     4278     +100     
- Misses       5172     5194      +22     
- Partials      435      439       +4     

Impacted Files	Coverage Δ
pkg/executor/sharding.go	0.00% <0.00%> (ø)
pkg/filter/dt/filter_http.go	15.59% <0.00%> (ø)
pkg/filter/dt/filter_mysql.go	1.60% <0.00%> (ø)
pkg/executor/read_write_splitting.go	47.74% <50.00%> (+1.25%)	⬆️
pkg/executor/single_db.go	51.21% <50.00%> (+1.80%)	⬆️
pkg/filter/breaker/breaker.go	61.53% <61.53%> (ø)
pkg/filter/rate/limiter.go	82.19% <82.19%> (ø)

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