First parameter of search $client->search->query should clearly accept `FilterQuery`

[g105b]

At the moment, it just accepts a string, but FilterQuery is Stringable... but there's no way for the developer to know that.

public function query(
	FilterQuery|string $query,  // much better for self-documentation
	SearchFilter $searchType,
	?string $market = null,
	int $limit = 20,
	int $offset = 0,
	?string $includeExternal = null,
):SearchResult