feat(ContextMenu): Add OnClickBefore callback event

[h2ls]

Add OnClickBefore callback event

Description

I would like to propose a new feature for the ContextMenu component: an OnClickBefore callback event. This event should be triggered right before the context menu is displayed when the user right-clicks. It would allow developers to perform actions or checks before the menu is rendered to the user.

Use Case

The OnClickBefore event would be extremely useful for dynamic context menu content, where menu items need to be determined based on the state of the application or specific conditions at the time of the right-click. For example, it could be used to enable or disable menu items, add new ones, or even cancel the display of the context menu altogether based on certain criteria.

Proposed Signature

[Parameter]
public Func<object?, Task>? OnClickBefore { get; set; }

close #4111

[bb-auto]

Thanks for your PR, @azlis. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8a4a136) to head (a68cfcc).
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files          597       598    +1     
  Lines        25941     25981   +40     
  Branches      3778      3784    +6     
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+ Hits         25941     25981   +40     

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