Add rule configuration support for parameter flow control in Sentinel Dashboard

[sczyh30]

Describe what this PR does / why we need it

Add rule configuration support for parameter flow control in Sentinel Dashboard.

Does this pull request fix one issue?

Resolves #175

Describe how you did it

• Update dashboard API client to support authority and parameter flow commands
• Add REST API controller for parameter flow rules in dashboard
• Add pages for configuring parameter flow rules
• Update dependencies: upgrade Spring Boot to 2.x and remove unused dependencies
• Other refinements

Describe how to verify it

Run the dashboard to verify the functions.

Special notes for reviews

None

[codecov-io]

Codecov Report

Merging #176 into master will increase coverage by 1.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #176      +/-   ##
============================================
+ Coverage     50.47%   51.55%   +1.07%     
- Complexity      817      836      +19     
============================================
  Files           139      139              
  Lines          4741     4799      +58     
  Branches        675      678       +3     
============================================
+ Hits           2393     2474      +81     
+ Misses         2067     2033      -34     
- Partials        281      292      +11

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/alibaba/csp/sentinel/log/RecordLog.java	72.41% <0%> (-4.06%)	5% <0%> (+1%)
...aba/csp/sentinel/slots/logger/EagleEyeLogUtil.java	90% <0%> (-3.34%)	4% <0%> (+2%)
...com/alibaba/csp/sentinel/log/CommandCenterLog.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
.../csp/sentinel/slots/block/degrade/DegradeRule.java	55.55% <0%> (+1.23%)	14% <0%> (ø)	⬇️
...a/com/alibaba/csp/sentinel/node/StatisticNode.java	66.66% <0%> (+1.58%)	18% <0%> (+1%)	⬆️
...ain/java/com/alibaba/csp/sentinel/log/LogBase.java	80.43% <0%> (+6.24%)	5% <0%> (ø)	⬇️
...a/csp/sentinel/slots/statistic/base/LongAdder.java	34.04% <0%> (+17.02%)	11% <0%> (+7%)	⬆️
...ibaba/csp/sentinel/eagleeye/BaseLoggerBuilder.java	77.77% <0%> (+19.15%)	11% <0%> (+5%)	⬆️
...a/csp/sentinel/slots/statistic/base/Striped64.java	56.25% <0%> (+30.2%)	8% <0%> (+3%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9ae079c...a9de164. Read the comment docs.

[CarpenterLee]

LGTM