Array function stubs

[spaze]

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[spaze]

This was a test to see if @mad-briller's #1571 would still misbehave (say callable(mixed, mixed) instead of callable(string, string) in the error message) with current PHPStan, and unfortunately I have to report that it sill does. From the test *uassoc results:

-31: Parameter #4 $key_compare_func of function array_uintersect_uassoc expects callable(string, string): int<-1, 1>, Closure(int, int): int<-1, 1> given.
+31: Parameter #4 $key_compare_func of function array_uintersect_uassoc expects callable(mixed, mixed): int, Closure(int, int): int<-1, 1> given.

When there's no key compare function, array-key is fine, and you only get string literals now, which is unrelated to this change in this PR:

-22: Parameter #3 $data_compare_func of function array_uintersect expects callable(string, string): int<-1, 1>, Closure(int, int): int<-1, 1> given.
+22: Parameter #3 $data_compare_func of function array_uintersect expects callable('a'|'b'|'c'|'d', 'a'|'b'|'c'|'d'): int<-1, 1>, Closure(int, int): int<-1, 1> given.

Tried checking existing stubs, but this seems beyond my knowledge right now, don't even know where to begin :(