feat: add circuit breaker actuator

[wenxuan70]

PR Type

Feature

Describe what this PR does for and how you did.

增加查询本服务相关的熔断规则

Adding the issue link (#xxx) if possible.

fixes #1003

Note

Checklist

• Add information of this PR to CHANGELOG.md in root of project.
• Add documentation in javadoc or comment below the PR if necessary.

Checklist (Optional)

• Will pull request to branch of 2020.0.
• Will pull request to branch of 2022.0.

[wenxuan70]

@SkyeBeFreeman 大佬有空帮忙review下代码

[codecov]

Codecov Report

Merging #1136 (8f72b4b) into 2021.0 (2c04288) will decrease coverage by 0.14%.
The diff coverage is 62.06%.

@@             Coverage Diff              @@
##             2021.0    #1136      +/-   ##
============================================
- Coverage     81.16%   81.03%   -0.14%     
- Complexity     1684     1688       +4     
============================================
  Files           252      254       +2     
  Lines          5735     5764      +29     
  Branches        677      680       +3     
============================================
+ Hits           4655     4671      +16     
- Misses          689      700      +11     
- Partials        391      393       +2     

Files Changed	Coverage Δ
...cent/cloud/polaris/context/ServiceRuleManager.java	41.02% <0.00%> (-8.98%)	⬇️
...olarisCircuitBreakerEndpointAutoConfiguration.java	50.00% <50.00%> (ø)
...reaker/endpoint/PolarisCircuitBreakerEndpoint.java	85.00% <85.00%> (ø)

... and 1 file with indirect coverage changes