Allow setting the `OR` logic for filter values inside a filter group

[nhoizey]

“Currently, the Default UI treats all filters as AND filters, meaning pages will only be shown if they match all toggled filters”: https://pagefind.app/docs/default-ui-filtering/

I would like to be able to select multiple filter values from a same filter group with an OR logic, having the AND logic still applied between filter groups.

For example, I would like to select (in pseudo code) pageType(Gear OR Gallery) AND location(America OR Africa).

The best would be to be able to define the logic for each filter group independently.

[tenmozes]

@bglw what do you think about providing the option to change from all to any for filter on global level for PageFind UI?