Allow exposed form to preserve URL query parameters

Tested #34 with Facets. Steps:

1. Go to edit the views of interest
2. Expand "Advanced" section
3. Click "Exposed form style: Settings"
4. Put f in the Preserve query parameters from URL
5. Save and clear cache

It works.

Tested #36 Works Great (this feature should definitely be added)

+1 (awesomesauce) saved me from having to use hook_form_views_exposed_form_alter() to modify the submitted query parameters for the exposed filter.

Specifically useful when having other view blocks on page that use contextual filters with setting "provide default value" -> "Type: Query parameter" which updates the content in those blocks when the set parameters are passed by URL from custom links that provide those additional parameters.

#36 works for me as well.

I've added the code back from #34 and created an interdiff with #36.

Still need to address point 2 and 3 from #32

Patch from #42 is working well for me, we have a search implementation that has custom query parameters that were being lost on exposed form search. Although that's not specifically facets, but I believe the issue is the same.

Confirming the issue with Better Exposed Filters described in #33. Somehow, when BEF is used, the value already comes as an array. Attaching a patch with a fix.

The patch in #45 applies and works with D10.2.5.

But only with a Exposed form style:Basic (Exposed form in block:no)

It does not work with: Basic (with layout)