feat: improve specialization

[elringus]

This adds CS and JSCtor parameters to [SpecializeImport] attribute, allowing to splice C# code into the generated C# proxy and JS code into the constructor of the generated JS proxy opening more ways to customize the specialized type behavior.

Also, when Decl start with export it will now replace the entire TypeScript declaration instead of splicing the content at the bottom of the default declaration.

These features, along with several fixes allow advanced specialization scenarios, for example turning properties of specific type into events on the JS side:

bootsharp/src/js/test/cs/Test.Library/Specialization.cs

Lines 60 to 92 in c4feb06

	[SpecializeImport(typeof(Event<>),
	CS:
	"""
	protected override object Unwrap () {
	if (Event != null) return Event;
	ImportedByEvent.Add(Event = new(), this);
	Subscribe(Event.Broadcast);
	return Event;
	}
	""",
	JSCtor:
	"""
	const event = new Event();
	event._id = _id;
	this.subscribe(event.broadcast.bind(event));
	return event;
	""",
	Decl:
	"""
	export interface Event<T extends (...args: never[]) => void> {
	readonly last?: Parameters<T>;
	subscribe(handler: T): string;
	unsubscribe(handler: T): void;
	broadcast: T;
	}
	""")]
	public abstract class EventImport<T> (int id) : SpecializedImport(id) where T : Delegate
	{
	protected internal static readonly ConditionalWeakTable<Event<T>, SpecializedImport> ImportedByEvent = new();
	protected Event<T>? Event;
	public abstract void Subscribe (T handler);
	}

Documentation: https://bootsharp.com/guide/specialization#injecting-code

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (382b218) to head (835fb2f).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #215   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           60        60           
  Lines         2929      2965   +36     
  Branches       532       542   +10     
=========================================
+ Hits          2929      2965   +36     

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