Fixed plugin generation for complex non primitive types

[bohdan-harniuk]

Description (*)
There was detected an issue with the generation of plugins for methods where specified non-primitive complex type as a parameter or as a return type. For example, generation will fail if specify type like that:

class SomeClass {
    public function method(?SomeType = null): ?SomeReturnType
    {  
    }
}

And the result was as:

The result of the fix:

In addition to the correction was also refactored code to be compatible with the last code style rules.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with integration/functional tests (if applicable)
• All automated tests passed successfully (all builds are green)

[eduard13]

Thank you for fixing it 👍