Allow specifying language variant

[XapaJIaMnu-at-meta]

Some wikipedia pages (such as Serbian and Chinese) have multiple language variants that are equivalent.

Fetching the content is then dependent on the variant variable in the API: https://zh.wikipedia.org/wiki/Special:API%E6%B2%99%E7%9B%92?uselang=en#action=parse&format=json&variant=zh-tw&page=Main%20Page&formatversion=2

I'm currently working around this by monkey-patching the wikipediaapi.Wikipedia._query method like this:

def patched_query(self, page: "WikipediaPage", params: dict[str, Any]):
        """Queries Wikimedia API to fetch content."""
        print(self._request_kwargs)
        if 'variant' in self._request_kwargs:
            params['variant'] = self._request_kwargs['variant']
            del(self._request_kwargs['variant'])
        base_url = "https://" + page.language + ".wikipedia.org/w/api.php"
        #log.info(
        #    "Request URL: %s",
        #    base_url + "?" + "&".join([k + "=" + str(v) for k, v in params.items()])
        #)
        params["format"] = "json"
        params["redirects"] = 1
        print(params)
        r = self._session.get(base_url, params=params, **self._request_kwargs)
        return r.json()

Ideally there would be a way to specify extra params that go to the wikipedia call, not just to the request library.

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