Introduce native type-hints and pass-by-reference values

[boesing]

Q	A
BC Break	yes
QA	yes

Description

This introduces almost all native type-hints. Those which are missing are either related to laminas-eventmanager or laminas-servicemanager. The latter will be updated in one of the next PRs.

This fixes #15

[boesing]

This contains all changes of #294 as well.

[Ocramius]

Only managed to look at very superficial level: test changes OK, only change that is a bit weird is callable|string types, which I think is wrong 🤔

[boesing]

Will double check that again. Problem is that it was "callable" beforehand and I am unsure if it allows strings pointing to functions.

[Ocramius]

Will double check that again. Problem is that it was "callable" beforehand and I am unsure if it allows strings pointing to functions.

see https://3v4l.org/qCIk0

<?php

function useCallable($input, callable $cb): mixed {
    return $cb($input);
}

var_dump(useCallable('123', 'intval'));
var_dump(useCallable('', 'intval'));
var_dump(useCallable('foo', 'intval'));
var_dump(useCallable(123.456, 'intval'));