optimize isProtobufClass method impl

[SpringStudent]

What is the purpose of the change

The isProtobufClass method is extracted as a tool class, and the implementation is optimized.

Brief changelog

optimize isProtobufClass method impl

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[AlbumenJ]

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
63.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f7a32be) 70.34% compared to head (c0bb406) 70.41%.
Report is 18 commits behind head on 3.2.

Additional details and impacted files

@@            Coverage Diff             @@
##              3.2   #13557      +/-   ##
==========================================
+ Coverage   70.34%   70.41%   +0.06%     
==========================================
  Files        1603     1605       +2     
  Lines       69886    69957      +71     
  Branches    10092    10090       -2     
==========================================
+ Hits        49161    49257      +96     
+ Misses      16096    16073      -23     
+ Partials     4629     4627       -2     

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[EarthChen]

LGTM