Refactor the code related to ReleaseMessage

[klboke]

What's the purpose of this PR

Refactor the code related to ReleaseMessage.

motivation

• Unify the generation method of ReleaseMessage and watchedKey.
• Abstract the parsing method of ReleaseMessage and unify the invocation.

[codecov]

Codecov Report

Merging #4822 (1c47cd6) into master (a86ed25) will increase coverage by 0.00%.
The diff coverage is 78.94%.

❗ Current head 1c47cd6 differs from pull request most recent head d1cf7ad. Consider uploading reports for the commit d1cf7ad to get more accurate results

@@            Coverage Diff            @@
##             master    #4822   +/-   ##
=========================================
  Coverage     48.15%   48.16%           
  Complexity     1719     1719           
=========================================
  Files           346      346           
  Lines         10777    10772    -5     
  Branches       1075     1076    +1     
=========================================
- Hits           5190     5188    -2     
+ Misses         5265     5262    -3     
  Partials        322      322           

Impacted Files	Coverage Δ
...lo/biz/grayReleaseRule/GrayReleaseRulesHolder.java	72.58% <50.00%> (+0.13%)	⬆️
...nfigservice/controller/NotificationController.java	91.22% <50.00%> (+1.22%)	⬆️
...igservice/controller/NotificationControllerV2.java	86.61% <50.00%> (+0.41%)	⬆️
...service/service/config/ConfigServiceWithCache.java	75.75% <50.00%> (-0.72%)	⬇️
...k/apollo/biz/utils/ReleaseMessageKeyGenerator.java	90.90% <100.00%> (+24.24%)	⬆️
...ework/apollo/configservice/util/WatchKeysUtil.java	93.61% <100.00%> (-0.27%)	⬇️

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[nobodyiam]

LGTM