CodeCamp #43 Support PETR in 1.1 in projects

[SekiroRong]

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Motivation

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Modification

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BC-breaking (Optional)

Does the modification introduce changes that break the back-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 45.23% // Head: 45.23% // No change to project coverage 👍

Coverage data is based on head (f0af246) compared to base (edc468b).
Patch has no changes to coverable lines.

❗ Current head f0af246 differs from pull request most recent head 7ee9757. Consider uploading reports for the commit 7ee9757 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #2175   +/-   ##
========================================
  Coverage    45.23%   45.23%           
========================================
  Files          253      253           
  Lines        20729    20729           
  Branches      3275     3275           
========================================
  Hits          9377     9377           
  Misses       10733    10733           
  Partials       619      619           

Flag	Coverage Δ
unittests	45.23% <ø> (ø)

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[ZwwWayne]

we do not need more folders, all files can be put in one folder, so that we can remove these unnecessary init.py files.