Add document from results to search context

Add a new button for each document in the search results allowing to use the document in the search context.

Details to be confirmed with @daudavi.

The main idea is to create a "semantic document browser" using items in document result list after search.

• any document in result list should have a feature to allow users to select that document and to execute a search at once.
• the access could be a button something similar to images in google search of 'icon quick search'
• selected document replaces all documents and texts listed in the panel of 'attached' documents
• chunk id is reused as query parameter
• filters and keywords should be kept as they are and not removed if there are any currently in use.
• selected item should appear in 'attached' panel and the title should be visible. Only that specific chunk should be used and not all chunks of that document.
• User should be able to review the text of that chunk in the same way as it is implemented for documents and text uploads.