feat(hz): support append_location when append_key = ''

[zhaozhihom]

What type of PR is this?

Support append_location when append_key is not 'method' or 'service'.

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• This PR title match the format: <type>(optional scope): <description>
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• 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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(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: Support append_location when append_key is not 'method' or 'service'
zh(optional): 当append_key不等于'method'或'service'的时候，支持从append_location插入内容

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(Optional) The PR that updates user documentation:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.21%. Comparing base (463ad91) to head (d78f2c5).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1285      +/-   ##
===========================================
- Coverage    73.17%   72.21%   -0.97%     
===========================================
  Files          138      138              
  Lines        13533    16137    +2604     
===========================================
+ Hits          9903    11653    +1750     
- Misses        3035     3887     +852     
- Partials       595      597       +2     

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[Marina-Sakai]

Hi, @zhaozhihom, may I ask more about the background? Specifically, the scenario where append_key is neither 'method' nor 'service'.