Implement Transaction Cancellation

[LaGodxy]

Cancel transactions. Acceptance: Cancel with reason, refund processing, notification, status update.

[solomonokeke012-bot]

@solomonokeke012-bot has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

help the poor and needy broo god god bless

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[drips-wave]

Congratulations, @solomonokeke012-bot! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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