Adds install command

[joedixon]

One of the outcomes of this PR is that it's possible to remove all service specific environment variables from the .env.example in the skeleton (laravel/laravel#6341) as they will be automatically added when installing Reverb.

Adds reverb:install command which carries out the following actions:

1. Adds all REVERB_ and VITE_REVERB_ prefixed variables to the environment file (ignoring any which already exist)
2. Publishes the Reverb configuration
3. User if prompted whether they wish to enable broadcasting. If yes and running L11, the install:broadcasting command is called. If yes and running L10, App\Providers\BroadcastServiceProvider::class is uncommented from app.php
4. User is prompted whether they wish to enable the Reverb broadcast driver. If yes, BROADCAST_DRIVER or BROADCAST_CONNECTION is set to reverb

Screen.Recording.2024-02-14.at.14.31.51.mov