Add `coffee disable` and `coffee enable` Commands

[tareknaser]

Description

This PR adds support for coffee disable and coffee enable commands, allowing users to toggle plugin status without complete uninstallation. The implementation ensures backward compatibility by making the new field "enabled" optional in the plugin struct.

Closes #102

Changes made

• Implemented disable and enable methods for CoffeeManager
• Added CLI commands coffee enable/disable <plugin_name>
• Included HTTP endpoints for the new commands
• Updated documentation

  To Do

• Integration testing for both coffee and coffee_httpd, to be added following #236
• Add coffee disable --all to disable all plugins with a single command

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