API to expose test results

[RealyUniqueName]

Currently, there is no way to access test results.
Something like this is needed:

public var success(default,null):Bool;
public getFailures():FailuresData;

maybe as an addition to utest.ui.common.IReport

Requested here:

#if js
	static function nodejsMain() {
		main();
		(untyped process).exit(Test.success ? 0 : 1);
	}
	#end

I couldn't immediately find how to get the success state of the tests.
(quote from HaxeFoundation/haxe#7901 (comment))

[Simn]

I realized that PlainTextReport has a built-in Sys.exit() in its complete function. So I'm not sure if this is a valid issue because the API clearly wants me to handle this differently.

[RealyUniqueName]

Well, yes.
You are expected to implement your own IReport. But that's not very convenient when you just want to handle success/fail state or amount of failures.

[Simn]

My point is that you can't handle success/fail yourself anyway if the thing Sys.exits on you.

[RealyUniqueName]

utest.Runner has callback onComplete which is called before the shutdown.

[Simn]

Looks like we indeed need this for HaxeFoundation/haxe@6924bab