feat: add onPieceDragCancel option to handle piece drag cancellations

[miguelmato]

Description

This PR adds onPieceDragCancel prop to be able to customize the UI cleanup when the user explicitly cancel a drag event by right clicking or pressing Escape.

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Manual Storybook Testing: Spun up pnpm storybook and verified that right clicking or pressing Escape triggers the callback but drag and dropping a piece outside the board does not.
• Static Testing: Ran pnpm test:static locally to ensure no TypeScript compilation errors or Prettier formatting
  issues were introduced by the updated ChessboardOptions type definitions.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[vercel]

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