Support for named argument in callable signatures

[mathroc]

callable signatures can have variable names, but I think they are ignored

now that we can use named arguments at call time, it would be useful to support them

https://psalm.dev/r/96ddbe571b

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/96ddbe571b

<?php

/**
 * @param callable(int $i): void  $c
 */
function f(callable $c): void {
    $c('a'); // Psalm properly see that the first argument is an int 
    $c(i: 0); // But its name was forgotten
}

Psalm output (using commit b940c7e):

ERROR: InvalidArgument - 7:8 - Argument 1 expects int, but 'a' provided

ERROR: InvalidNamedArgument - 8:8 - Parameter $i does not exist on function