Remove deprecations passing $options as int

[franmomu]

The deprecation was only in Search::setOptionsAndQuery() method, but it affected the other ones.

[ruflin]

This is one of the changes I wonder how big the impact will be. I like the change but I wonder if we should still allow null to be passed in:

$index->search('hans', null, Request::GET);

I expect that is something quite a few will use instead of

$index->search('hans', [], Request::GET);

Our code gets cleaner by removing it but search is likely one of the most used functions in the library. So changing it can have a big impact. Thoughts?

[franmomu]

thanks for the review! In this case the only deprecation was to pass an int, so I think it makes sense to allow null. I guess I removed it because I did this one after #2147