Introduce extend command to allow sandbox reservation extension

[andrzejkupczyk]

This pull request adds support for extending sandbox bookings in the messaging bot. The main change is the introduction of a new command handler that allows users to extend their sandbox reservation by resetting the due date to five additional working days if they are the current owner.

New sandbox extension feature:

• Added messages/extend.js handler to process extension requests for sandboxes, including logic to verify ownership, update the booking date, and calculate the new due date based on working days.
• Registered the new extend handler in messages/index.js so the bot recognizes and responds to extension commands.

[Copilot]

Pull Request Overview

This PR introduces a new "extend" command functionality to the messaging bot that allows users to extend their sandbox reservations for an additional 5 working days.

• Added a new command handler for sandbox extension requests
• Updated the bot to recognize and process extension commands
• Incremented the package version to reflect the new feature

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
package.json	Version bump from 2.1.1 to 2.2.0 for new feature release
messages/index.js	Registered the new extend handler to enable command recognition
messages/extend.js	New command handler implementing sandbox extension logic with ownership verification

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