feat: add select all shortcut function to the table

[LIlGG]

What type of PR is this?

/area editor
/area ui
/kind feature
/milestone 2.14.x

What this PR does / why we need it:

为默认富文本编辑器中的表格，增加全选快捷键。具体操作逻辑如下：

1. 当光标处于表格中单元格内时，按 Mod + a 全选快捷键后，若未选中当前单元格，则选中单元格。
2. 若其中包含有其他影响全选快捷键的组件，则以组件自身为准，例如代码块中的全选。
3. 若已经选中单元格，则再次按全选快捷键，选中整个表格。
4. 若已经选中表格，则再按全选快捷键不会触发其他全选事件。

How to test it?

按照操作逻辑测试全选快捷键逻辑是否无误。是否与其他快捷键产生冲突。

Which issue(s) this PR fixes:

Fixes #5438

Does this PR introduce a user-facing change?

为富文本编辑器中的表格组件增加全选快捷键

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.92%. Comparing base (5fdf6c0) to head (e0eaf39).
Report is 40 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5443      +/-   ##
============================================
+ Coverage     56.91%   56.92%   +0.01%     
- Complexity     3319     3345      +26     
============================================
  Files           587      589       +2     
  Lines         18968    19145     +177     
  Branches       1401     1394       -7     
============================================
+ Hits          10795    10899     +104     
- Misses         7594     7663      +69     
- Partials        579      583       +4     

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[ruibaby]

/lgtm

[JohnNiang]

It works very well.

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• ui/OWNERS [JohnNiang]

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