Feat/custom onDropHandler for viewportGrid

[Jaseel-trenser]

Context

• An option has been implemented to allow custom onDropHandler in viewort grid. This enhancement enables users for handling of additional functionalities during the onDrop event to the viewport.
• This PR has been incorporated by FlyWheel.io.

Changes & Results

• Introduced a custom onDropHandler to handle additional functionalities during the onDrop to the viewpor

Testing

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• OS: Windows 11
• Node version: 18.20.3
• Browser: Chrome

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