Support declaring known type variadic named arguments

[alex-dev]

Support declaring known type variadic named arguments

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/8fe49d73bf

<?php

function foo(string $_bar, int $_baz): void {
}


/** @param array{_bar?: string, _baz?: int} $args */
function indirect(mixed ...$args): void {
    foo(...$args + ['_bar' => 'bar', '_baz' => 1]);
}

indirect(wolo: 'wolo');

Psalm output (using commit 16b24bd):

ERROR: InvalidScalarArgument - 9:12 - Argument 1 of foo expects string, but int|string provided

ERROR: InvalidScalarArgument - 9:12 - Argument 2 of foo expects int, but int|string provided