fix(numfmt): add or substract decimal inheritance

[Gggpound]

close #1597

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 28.63%. Comparing base (d8ca9f6) to head (741d24c).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
...umfmt/src/commands/commands/add-decimal.command.ts	0.00%	8 Missing ⚠️
.../src/commands/commands/subtract-decimal.command.ts	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3195      +/-   ##
==========================================
- Coverage   28.63%   28.63%   -0.01%     
==========================================
  Files        2024     2024              
  Lines      106969   106985      +16     
  Branches    23120    23126       +6     
==========================================
  Hits        30635    30635              
- Misses      76334    76350      +16     

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[zhaolixin7]

@Gggpound 常规，多位小数时点击减少小数位会变成一位小数
2024_8_27 11_38_08 video.webm

[univer-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

@Gggpound Normally, when there are multiple decimal places, click to reduce the decimal places and it will become one decimal place.
2024_8_27 11_38_08 video.webm