[11.x] Extract ShowModelCommand functionality to separate class

[cosmastech]

The ShowModelCommand provides incredibly valuable information. It seems like third-party packages would be able to benefit from a unified way to retrieve model data. For instance, the laravel-ide-helper package has very similar logic. Larastan (which I don't assume this would replace, but pointing it out). Laravel Blueprint does a lot of this sort of parsing as well.

My thought is that this could be useful for a package that generates DTOs for models, thinking in terms of the idea of creating frozen models.

---

This also adds a fairly simple test for the console command output which previously was untested.

It would be nice if this command also returns the Model's $builder class and $collectionClass. There could also be a number of docblock generics added to arrays in these functions. I figured this was already a pretty large PR, so that could follow up (whether this is accepted or not).

Example Output

$modelDetails = app(ModelInspector::class)->inspect(User::class);
/*
[
    "class" => "App\Models\User",
    "database" => "mysql",
    "table" => "users",
    "policy" => null,
    "attributes" => Illuminate\Support\Collection {#6567
      all: [
        [
          "name" => "id",
          "type" => "bigint unsigned",
          "increments" => true,
          "nullable" => false,
          "default" => null,
          "unique" => true,
          "fillable" => false,
          "hidden" => false,
          "appended" => null,
          "cast" => "int",
        ],
        [
          "name" => "first_name",
          "type" => "varchar(255)",
          "increments" => false,
          "nullable" => false,
          "default" => null,
          "unique" => false,
          "fillable" => true,
          "hidden" => false,
          "appended" => null,
          "cast" => null,
        ],
        [
          "name" => "last_name",
          "type" => "varchar(255)",
          "increments" => false,
          "nullable" => false,
          "default" => null,
          "unique" => false,
          "fillable" => true,
          "hidden" => false,
          "appended" => null,
          "cast" => null,
        ],
        [
          "name" => "email",
          "type" => "varchar(255)",
          "increments" => false,
          "nullable" => false,
          "default" => null,
          "unique" => true,
          "fillable" => true,
          "hidden" => false,
          "appended" => null,
          "cast" => null,
        ],
        [
          "name" => "profile_photo_url",
          "type" => "text",
          "increments" => false,
          "nullable" => true,
          "default" => null,
          "unique" => false,
          "fillable" => true,
          "hidden" => false,
          "appended" => null,
          "cast" => null,
        ],
        [
          "name" => "created_at",
          "type" => "timestamp",
          "increments" => false,
          "nullable" => true,
          "default" => null,
          "unique" => false,
          "fillable" => false,
          "hidden" => false,
          "appended" => null,
          "cast" => "datetime",
        ],
        [
          "name" => "updated_at",
          "type" => "timestamp",
          "increments" => false,
          "nullable" => true,
          "default" => null,
          "unique" => false,
          "fillable" => false,
          "hidden" => false,
          "appended" => null,
          "cast" => "datetime",
        ],
      ],
    },
    "relations" => Illuminate\Support\Collection {#6653
      all: [
        [
          "name" => "tokens",
          "type" => "MorphMany",
          "related" => "App\Models\PersonalAccessToken",
        ],
        [
          "name" => "notifications",
          "type" => "MorphMany",
          "related" => "Illuminate\Notifications\DatabaseNotification",
        ],
      ],
    },
    "events" => Illuminate\Support\Collection {#6650
      all: [],
    },
    "observers" => Illuminate\Support\Collection {#6656
      all: [],
    },
    "collection" => "Illuminate\Database\Eloquent\Collection",
    "builder" => "Illuminate\Database\Eloquent\Builder",
  ]
 */

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