[9.x] Add ability to Model::query()->touch() to mass update timestamps

[stevebauman]

This PR adds the touch($column = null) method to the Eloquent query builder.

This is a convenience method, allowing you to mass update a model's timestamp in the database table with or without query constraints:

Mass touching the updated at column:

$touched = User::query()->touch();

Mass touching the updated at column with constraints:

$touched = User::where('email', 'like', '%@company.com')->touch();

Mass touching a specific column:

$published = Post::query()->touch('published_at');

It behaves identically to $model->touch(), and accepts the same method argument.

Let me know your thoughts! Thanks for your time 🙏