feat: support delegates

[elringus]

This adds support for delegates and resolves #183.

Any kind of delegate is supported: Action<>, Func<> or custom types created with the delegate keyword. Delegates are supported on all surface types (static, module and instanced) and members (method, property, event).

In JavaScript the delegates are materialized as plain callable functions, for example:

public class Class
{
    [Export] public static Action<string>? Logger { get; set; }
}

— produces following type declaration:

export namespace Class {
    export let logger: Action<string> | undefined;
}

— and can be used like this:

import { Class } from "bootsharp";

Class.logger = msg => console.log(msg);
Class.logger("hello");

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (170dc51) to head (f95c539).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #208   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           60        60           
  Lines         2771      2845   +74     
  Branches       465       479   +14     
=========================================
+ Hits          2771      2845   +74     

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