Use JsonldNormalizerUtils in context to generate URI

[whikloj]

GitHub Issue: Islandora/documentation#1766

What does this Pull Request do?

Uses the new provided utility class to generate a URI for the JSON-LD that correctly does/does not add the ?_format=jsonld suffix depending on the configuration.

What's new?

• Does this change require documentation to be updated? No
• Does this change add any new dependencies? No
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)? No
• Could this change impact execution of existing code? No

How should this be tested?

Requires Islandora/jsonld#58

With a normal Islandora setup:

1. Ensure that in Admin -> Configuration -> Search and metadata -> Jsonld, the Remove jsonld parameter from @ids is checked.
2. Add an item (with URI) to the Person taxonomy.
3. Create a new Repository Item
4. Add the above Person in the "Linked Agent" field with some relationship.
5. Save the Repository Item.
6. View the JSON-LD for that node by adding ?_format=jsonld to the URI. (ie. http://localhost:8000/node/1?_format=jsonld)
7. See that while most of the @id and @type elements DON'T have a ?_format=jsonld suffix, the relation (depending on which you chose) DOES.
8. Pull in the associated JSON-LD PR and this PR.
9. Re-do the above steps and see that the relation URI in the JSON-LD will add or remove the ?_format=jsonld based on the JSON-LD configuration.

Interested parties

@Islandora/8-x-committers @seth-shaw-unlv @mdlincoln @kspurgin

[seth-shaw-unlv]

@whikloj, with this PR, if you use JSON-LD you must have the dev branch installed or else it will throw errors. Can we issue a minor release of the JSON-LD module and then add a conflicts directive to this module's composer.json for anything less than the new JSON-LD minor version?

[kstapelfeldt]

This will wait until the end of the week and the official communication/final feedback on semantic versioning.

[seth-shaw-unlv]

Thanks. Once we get the new JSON-LD tag I'll test with composer and then merge.