Show canonical dataset in MetadataView

[robyngit]

This PR introduces a feature that a visually identifies a dataset as essentially a duplicate of another in the MetadataView. It does this by adding and modifying some components of the view.

New CanonicalDatasetHandlerView

Added a new view, CanonicalDatasetHandlerView that handles identifying and displaying the canonical dataset within a Metadata view.

This new view is a "scoped subview", a self-contained view that is responsible for managing a specific part of UI within a larger parent view. In this case, the CanonicalDatasetHandlerView handles inspecting and modifying specific parts of the already-rendered DOM within the MetadataView. Creating a new view for this purpose avoids adding more complexity to the already very large MetadataView.

The CanonicalDatasetHandlerView is responsible for the following tasks:

• Inspects the annotations in the MetadataView to identify a canonical dataset.
  • When annotations include both schema.org:sameAs and prov:derivedFrom annotations that have the value, this is assumed to be a reference the DOI of the canonical dataset.
• Modifies the MetadataView when a canonical dataset is detected, by:
  • Hiding the annotation views that identify the canonical dataset
  • Adding a "info icon" that indicates the dataset is essential a duplicate of another dataset. (An info icon is like the "private" or "archived" icons near the title).
  • Adds a second citation to the citation modal
  • Adds a blue alert box at the top of the page, under the title, that includes the citation to the original dataset

New CrossRef model

• Introduced a new model to handle querying the CrossRef API for metadata about a DOI, including methods for caching responses and clearing the cache.

Changes to other components

Citation Model

• Added properties for issue and methods to extract volume and issue from the source model. Updated getJournalFromSourceModel and getPidFromSourceModel to handle getting these values from a CrossRefModel.

Citation View

• Updated the template to include issue and adjust the formatting of the journal, volume, and page information.

Metadata View

• Deprecated the metadataInfoIcons template in favour of rendering icons directly in the MetadataView methods. This allows us to reuse the logic for adding a "duplicate" icon in the MetadataView along side the private and archived icons.
• Added checks to avoid re-rendering issue
• Insert and render the CanonicalDatasetHandlerView

[robyngit]

Changes to do based on feedback from @mbjones:

• Move the canonical citation above the "this version" citation in the citation modal
• Make the canonical citation on the landing page more prominent, and somewhere near/at the top of the page

[robyngit]

Also fix a problem found in testing:

• datasets that are private but that the logged in user has authorization to view are sometimes shown as private anyways.