feat: drag-element add trigger config

[XiaoMing-xmg666]

Feat: #7100
增加了drag-element trigger配置项，文档改动之后再提一个pr，效果如下

[gemini-code-assist]

Summary of Changes

Hello @XiaoMing-xmg666, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the drag-element behavior by introducing a new trigger configuration. This feature allows developers to define specific keyboard shortcuts that must be held down for an element to be draggable, providing more precise control over user interactions and preventing unintended dragging. The change integrates a new Shortcut utility to manage key press detection and updates the drag validation logic accordingly.

Highlights

• New trigger configuration: Introduced a trigger option in DragElementOptions to specify keyboard shortcuts that must be pressed to activate the drag behavior for elements.
• Shortcut integration: Integrated a Shortcut utility class to manage and detect specific key combinations, enabling the new trigger functionality.
• Conditional dragging: The validate method within the DragElement behavior now checks the trigger configuration, ensuring that dragging is only enabled when the specified keys are actively pressed.

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[gemini-code-assist]

Code Review

这个 PR 为 drag-element 行为增加了一个 trigger 配置项，允许用户通过组合键来触发拖拽，这是一个很好的功能增强。代码整体实现清晰，但在 isKeydown 方法的实现上，我发现一个问题可能会导致默认行为发生非预期的改变。当 trigger 未配置或为空数组时，拖拽应该总是允许的，但目前的实现会限制在没有任何按键按下的情况下才能拖拽。我已经在具体的代码行提出了修改建议以修正此问题。

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.59%. Comparing base (62e2278) to head (0f06220).

Files with missing lines	Patch %	Lines
packages/g6/src/behaviors/drag-element.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v5    #7497      +/-   ##
==========================================
- Coverage   95.60%   95.59%   -0.01%     
==========================================
  Files         188      188              
  Lines        9874     9881       +7     
  Branches     2083     2133      +50     
==========================================
+ Hits         9440     9446       +6     
- Misses        402      435      +33     
+ Partials       32        0      -32     

Flag	Coverage Δ
g6	95.59% <87.50%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/g6/src/behaviors/drag-element.ts	95.97% <87.50%> (-0.44%)	⬇️

... and 12 files with indirect coverage changes

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[hustcc]

文档和代码在一个 pr 里面完成吧，避免官网出现不一致。

[XiaoMing-xmg666]

文档和代码在一个 pr 里面完成吧，避免官网出现不一致。

@hustcc 加上了