Add main metadata component

[abelemlih]

Ticket #1328

• Add DocumentMetadataComponent, a child of the view component Blacklight::DocumentMetadataComponent that contains custom filtering functionality
• Add MainMetadataComponent, a view component that displays main metadata in a document's show page.
• Remove deprecated presenter app/presenters/main_metadata_presenter.rb and add business logic to MainMetadataComponent

Note:

Remaining rspec failures will be addressed in future tickets. This ticket is primarily focused on main metadata display on the show page.

Component Screenshot: