Optimize URL#addParameters method to reuse existing methods

[BurningCN]

What is the purpose of the change

Optimize URL#addParameters method to reuse existing methods

[codecov-commenter]

Codecov Report

Merging #8005 (36bdfc5) into master (9f6b536) will increase coverage by 0.07%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #8005      +/-   ##
============================================
+ Coverage     60.85%   60.92%   +0.07%     
  Complexity      491      491              
============================================
  Files          1089     1090       +1     
  Lines         43876    43946      +70     
  Branches       6413     6421       +8     
============================================
+ Hits          26699    26774      +75     
+ Misses        14208    14195      -13     
- Partials       2969     2977       +8     

Impacted Files	Coverage Δ
...mon/src/main/java/org/apache/dubbo/common/URL.java	50.10% <50.00%> (-0.11%)	⬇️
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	⬇️
...n/java/org/apache/dubbo/common/utils/LFUCache.java	80.86% <0.00%> (-5.42%)	⬇️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	77.40% <0.00%> (-1.49%)	⬇️
...ting/zookeeper/curator/CuratorZookeeperClient.java	69.54% <0.00%> (-1.15%)	⬇️
...etadata/report/support/AbstractMetadataReport.java	59.70% <0.00%> (-0.98%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	81.02% <0.00%> (-0.26%)	⬇️
...n/java/org/apache/dubbo/config/ConsumerConfig.java	92.85% <0.00%> (ø)
...apache/dubbo/rpc/cluster/support/ClusterUtils.java	60.00% <0.00%> (ø)
... and 13 more

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[chickenlj]

LGTM.