feat : create a new plugin command

[mo-salah1998]

This PR introduces a new plugin command to the Hexabot CLI, enabling users to quickly scaffold a new plugin within the plugins directory. The command streamlines the process of creating the necessary file structure and boilerplate code for a new plugin.

hexabot plugin <pluginName>

• pluginName : The name of the plugin (must be in kebab-case).

plugins/
└── <pluginName>/
    ├── README.md
    ├── index.plugin.ts
    ├── package.json
    ├── settings.ts
    └── i18n/
        └── en/
            └── title.json

Validation:

Ensures the plugin name is in kebab-case (^[a-z0-9]+(-[a-z0-9]+)*$).
Prevents overwriting an existing plugin by checking if the folder already exists.

Boilerplate Files:

README.md: Basic documentation template.
index.plugin.ts: Entry point for the plugin.
package.json: Pre-filled manifest file with basic metadata.
settings.ts: Placeholder for plugin-specific settings.
i18n/en/title.json: Starter file for plugin localization.