Add option to preserve existing query params

Problem/Motivation

If a user wants to create a link to another display in a View and preserve the query string params they have set (e.g. exposed form filters, facets, etc.) they can't use Views Link Area to do so. In my particular use case, I want to create a link to a Views Data Export display and need to retain the query params in the link to the batch endpoint.

Would me to set the link area to point to "/export/report" and

Proposed resolution

Add an option to preserve querystring params for the current page on the generated link. Giving priority to values set in the link config itself by the user.

User interface changes

New advanced option in the settings.

API changes

None

Data model changes

None