add filesets to search for collection show page

[labradford]

Fixes #1875

When viewing a collection page, the central search bar does not return results for the content or metadata of works or sub-collections, only the titles. Optimally, this search would function just as the main search bar for each tenant does, searching the text of PDFs, and all metadata fields, but only within the collection.

Changes proposed in this pull request:

• adds a decorator the includes methods to add filesets to the search on the collection show pages
• adds all_text_timv to the catalog controller search fields

@samvera/hyku-code-reviewers