Ability to set casts/data types to multilingual attributes in Eloquent Model

[Vitaliy-1]

Describe the bug
As part of #10328 multilingual attributes are introduced. For now, it's impossible to set a specific cast for the as per Laravel documentation:

    protected function casts(): array
    {
        return [
            'title' => 'string',
            'description' => 'string',
        ];
    }

because multilingual values actually are arrays

Apart of that, consider also if ability to directly add multilingual value in the default locale is beneficial, e.g.:

Announcement::create([
    "assocType" => "256",
    "assocId" => "1",
    "typeId" => null,
    "title" => "Test Announcement 201",
    "description" => "<p>Test Announcement 201</p>",
    "descriptionShort" => "<p>Test Announcement 201</p>",
    "someData" => "my new data"
]);

see: #10382 (comment)

[touhidurabir]

@Vitaliy-1 please check the commit bed3f45 .

I initially planned to make this a separate PR but as few fix needed related to handle the update and guarded attributes, I have made the fix of this a part of #10292