feat: add circuit breaker actuator.

[SkyeBeFreeman]

PR Type

Feature.

Describe what this PR does for and how you did.

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.
• Will pull request to branch of hoxton.

[codecov]

Codecov Report

Merging #1170 (e5af084) into 2022.0 (424c791) will increase coverage by 0.09%.
The diff coverage is 72.22%.

@@             Coverage Diff              @@
##             2022.0    #1170      +/-   ##
============================================
+ Coverage     76.89%   76.98%   +0.09%     
- Complexity     1618     1627       +9     
============================================
  Files           257      259       +2     
  Lines          5843     5879      +36     
  Branches        717      723       +6     
============================================
+ Hits           4493     4526      +33     
+ Misses          955      951       -4     
- Partials        395      402       +7     

Files	Coverage Δ
...olarisCircuitBreakerEndpointAutoConfiguration.java	100.00% <100.00%> (ø)
...reaker/endpoint/PolarisCircuitBreakerEndpoint.java	80.95% <80.95%> (ø)
...cent/cloud/polaris/context/ServiceRuleManager.java	66.66% <53.84%> (+16.66%)	⬆️