[9.x] Support Enumerable in Stringable

[erikgaal]

This PR adds simple quality of life improvement which allows us to pass Enumerable objects such as Collection to the Stringable helper functions that already accept array as a parameter.

For example, in a project I'm working on, we're doing the following:

/** @var Collection<array-key, string> $months */
$months = months();

Str::remove($months->toArray(), $someString);

With this PR we can skip the ->toArray call.

/** @var Collection<array-key, string> $months */
$months = months();

Str::remove($months, $someString);

[rodrigopedra]

iterable maybe?

https://www.php.net/manual/en/language.types.iterable.php

[erikgaal]

The code works, but PHPStan throws an error now even when passing an array. Will investigate and send a PR to fix.

https://phpstan.org/r/363ce01b-696f-4e26-8c90-ba9f93b943e8