Update format for Model completion

[bastien-phi]

As suggested in #57, using a duplicated class in _ide_helper.php file does not always work.

Unfortunately, using @mixin breaks :

• 1 Model::query() methods completion
• 2 $model->relation() method completion
• 3 PHPStan analysis ( PHPDoc tag @mixin contains unknown class NextIdeHelper\App\Models\User.)

In the contrary, it brings some improvements:

• Wider ide support
• Remove duplicate class warning
• Better goto action (no need to select the correct class)
• Adds ability to create method from call on non existent method in the model

For 1 and 2, using .phpstorm.meta.php can do the trick :

    override(\App\Models\User::query(), map(['' => '\IdeHelper\App\Models\__UserQuery'])); // 1
    override(\App\Models\Task::user(), map(['' => '\IdeHelper\App\Models\Task\__User'])); // 2

For 3, we need to add

parameters:
  scanFiles:
    - _ide_models.php

Maybe another change is possible to fix the issue (ignoring the error with '#PHPDoc tag @mixin contains unknown class NextIdeHelper\\.*\.$#')

Changing this feature can be a good time for a global rework of files architecture, improvements, ...
Something like the folder architecture could cleanup all files :

app/
...
ide_helper/
    .phpstorm.meta.php/
        helpers.php
        models.php
    aliases.php
    macros.php
    models.php