feat(hz): support extends for thrift

[FGYFFFF]

What type of PR is this?

feat

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• This PR title match the format: <type>(optional scope): <description>.
• The description of this PR title is user-oriented and clear enough for others to understand.
• Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo.

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thrift 支持 extend 关键字来拓展 service 的定义

(Optional) More detail description for this PR(en: English/zh: Chinese).

en: thrift 支持 extends 关键字来拓展 service 的定义
zh(optional): thrift supports the 'extends' keyword to extend the definition of service

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.08 ⚠️

Comparison is base (c8ffa58) 75.63% compared to head (0d68726) 75.56%.

❗ Current head 0d68726 differs from pull request most recent head cc30811. Consider uploading reports for the commit cc30811 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #765      +/-   ##
===========================================
- Coverage    75.63%   75.56%   -0.08%     
===========================================
  Files           97       97              
  Lines         9477     9477              
===========================================
- Hits          7168     7161       -7     
- Misses        1859     1865       +6     
- Partials       450      451       +1     

see 1 file with indirect coverage changes

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