feat(example): add doc uniscript example

[Dushusir]

• I am sure that the code is update-to-date with the dev branch.

close #

• add doc uniscript demo
• add doc appendText api for facade

test:

1. open doc-uniscript demo
2. open uniscript panel
3. paste this code univerAPI.getActiveDocument()?.appendText('Hello, Univer!');
4. excute script
5. check the document content change

[github-actions]

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📑 Examples	📚 Storybook
🔗 Preview link	🔗 Preview link

[codecov]

Codecov Report

Attention: Patch coverage is 42.30769% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 32.68%. Comparing base (271574a) to head (e714aff).

Files	Patch %	Lines
packages/facade/src/apis/facade.ts	17.39%	19 Missing ⚠️
packages/facade/src/apis/docs/f-document.ts	62.06%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1495      +/-   ##
==========================================
+ Coverage   32.67%   32.68%   +0.01%     
==========================================
  Files         906      907       +1     
  Lines       50465    50514      +49     
  Branches    10520    10526       +6     
==========================================
+ Hits        16491    16513      +22     
- Misses      33974    34001      +27     

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