Add access modifiers to code generating

### Description

Using Alt+Insert we can generate different code - constructors, getters, setters etc. I suggest to let user choose what access modifier will be used for generated code. For example, using combo box or radio buttons with values: public, protected, default, private.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Start by locating the Alt+Insert code-generation entry points for constructors, getters, and setters. Review how each generator chooses access modifiers and how its options are presented. Done means users can choose public, protected, default, or private and the generated code consistently uses that choice.

Written by the indexing model from the issue text.