refactor: Plugins

[S222em]

Please describe the changes this PR makes and why it should be merged: This PR refactors inhibitors so that they more useful in several cases. Below is an example of how to use plugins now, and some internal systems have been changed/renamed to support/use this new system. These new plugins can provide better support for typescript, and adds more use cases in general, like a database of choice.

import { container, GClient, Plugin, PluginHookType } from 'gcommands';

new Plugin({
	name: 'some-plugin',
	[PluginHookType.AfterInitialization]: (client: GClient) => {
		container.somePlugin = client.options.somePlugin;
	},
});

declare module 'gcommands' {
        // add somePlugin to the client options
	interface GClientOptions {
		somePlugin: number;
	}
        // add somePlugin to the container
	interface Container {
		somePlugin: number;
	}
}

Yes, this system is inspired by @sapphire/framework plugin system.

Status and versioning classification:

• This PR changes the library's interface (methods or parameters added)
• This PR includes breaking changes (methods removed or renamed, parameters moved or removed)