TOW-916 feat: create a tower package command

[konstantinoscs]

For debugging purposes (and for the example apps project), we need a way to generate and keep the package.tar.gz locally without deploying it.

[Copilot]

Pull Request Overview

This PR introduces a new package command to the Tower CLI that creates a tar.gz package file from an application without deploying it. This allows users to build distributable packages locally for testing or manual deployment.

Key changes:

• Adds a new package subcommand with --dir and --output options
• Implements package building logic using existing Tower package infrastructure
• Integrates the command into the main CLI application

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
crates/tower-cmd/src/package.rs	New module implementing the package command with argument parsing and package creation logic
crates/tower-cmd/src/lib.rs	Integration of the package module and command into the main CLI application

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[bradhe]

LGTM