Update filter.stub to use typed property declaration

[Thavarshan]

This Pull Request resolves issue #8 by updating the filter.stub file to include a type declaration for the $filters property, ensuring compatibility with PHP 7.4 and above where property types are supported. The explicit array type declaration enforces that $filters is always an array, preventing type errors.

Background & Issue:

In environments running PHP 7.4+, the filter.stub was causing a fatal error due to the lack of a type declaration for the $filters property. This update ensures that when a filter class is generated, it will have a properly typed property, as required by PHP 7.4+.

Changes Made:

• Added a type declaration to the $filters property within the filter.stub file.

Before:

protected $filters = ['filter'];

After:

protected array $filters = ['filter'];

Testing:

• Generated a new filter class using the updated stub to ensure the $filters property is correctly typed.
• Ensured that the new filter class works as expected without any type errors.

PHP Version Compatibility:

• This change is compatible with PHP 7.4 and above. Projects using an earlier version of PHP should update accordingly to accommodate typed properties.

Additional Notes:

• This change adheres to modern PHP standards and improves code reliability by leveraging PHP's type system.