unify license-header style.

[damonxue]

#3697
task 1: unify license-header style.

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #3708 (9e5fa17) into master (ec17f7e) will increase coverage by 0.16%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3708      +/-   ##
============================================
+ Coverage     63.42%   63.58%   +0.16%     
- Complexity     5947     5977      +30     
============================================
  Files           897      897              
  Lines         24681    24681              
  Branches       2249     2249              
============================================
+ Hits          15653    15694      +41     
+ Misses         7607     7570      -37     
+ Partials       1421     1417       -4     

Impacted Files	Coverage Δ
...ava/org/apache/shenyu/admin/utils/BaseTrigger.java	0.00% <ø> (ø)
...ache/shenyu/admin/utils/PluginHandleH2Trigger.java	0.00% <ø> (ø)
...java/org/apache/shenyu/admin/utils/ResultUtil.java	0.00% <ø> (ø)
...apache/shenyu/admin/utils/ShenyuDictH2Trigger.java	0.00% <ø> (ø)
...ache/shenyu/client/tars/common/dto/TarsRpcExt.java	30.76% <ø> (ø)
...che/shenyu/plugin/metrics/constant/LabelNames.java	0.00% <ø> (ø)
...ter/client/grpc/ShenyuGrpcClientConfiguration.java	100.00% <ø> (ø)
...r/client/motan/ShenyuMotanClientConfiguration.java	100.00% <ø> (ø)
...ter/client/sofa/ShenyuSofaClientConfiguration.java	100.00% <ø> (ø)
...ter/client/tars/ShenyuTarsClientConfiguration.java	100.00% <ø> (ø)
... and 35 more

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