Wider support for psalm-import-type

[lstrojny]

ATM psalm type imports can only happen on a class level. Would be great if it would be supported on a function level as well. See https://psalm.dev/r/55c13f2794

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/55c13f2794

<?php
/**
 * @psalm-type Tp string
 */
class Foo {}


/**
 * @psalm-import-type Tp from Foo
 * @return Tp
 */
function f() {
    return 'val';
}

Psalm output (using commit 70a024f):

ERROR: PossiblyInvalidDocblockTag - 9:4 - Docblock tag @psalm-import-type is not recognized in the function docblock for f

[lstrojny]

Duplicate of #4807