feat: createWidget and clearWidget

[yuedud]

Description

#3324
增加两个方法

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [✅] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #3337 (fd347d7) into master (8b1f661) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head fd347d7 differs from pull request most recent head 920701e. Consider uploading reports for the commit 920701e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3337      +/-   ##
==========================================
- Coverage   27.12%   27.12%   -0.01%     
==========================================
  Files         274      274              
  Lines       16351    16352       +1     
  Branches     3855     3855              
==========================================
  Hits         4435     4435              
- Misses      11539    11540       +1     
  Partials      377      377              

Flag	Coverage Δ
x6	10.42% <ø> (-0.01%)	⬇️
x6-common	62.24% <ø> (ø)
x6-geometry	50.74% <ø> (ø)

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see 1 file with indirect coverage changes