Option to override the default Mail model class

[Jacobtims]

I want to override the default Mail model class because I use tenancy in my application. I would like to have a similar option in the config, as the override for the Filament EmailResource class.
Something like this:

<?php

// config for RickDBCN/FilamentEmail
return [
    'resource' => [
        'class' => \App\Filament\Resources\EmailResource::class,
        'model' => \App\Models\Email::class,
    ],
];

I now need to force override it in my AppServiceProvider register() method, which is not a nice way:

$loader = AliasLoader::getInstance();
$loader->alias(\RickDBCN\FilamentEmail\Models\Email::class, \App\Models\Email::class);

[RickDBCN]

Hi Jacob,

Great idea! I'll probably get this sorted next week.

If you can find time to PR this in the mean time, that would be highly appreciated. Otherwise I'll do it somewhere next week.