Featured Items - Collection Page

[g-saracca]

What this PR does / why we need it:

Add featured items section in the Collection Page.
Allows users that can edit a collection to create "featured items" that will initially support content and an optional image.
These "featured items" will be shown between the Collection page header and the items list.

Which issue(s) this PR closes:

• Closes Featured Items - Collection Page #568

Special notes for your reviewer:

Suggestions on how to test this:

Step 1: Run the Development Environment

1. Execute npm i.
2. Navigate with cd packages/design-system && npm i && npm run build.
3. Return with cd ../../.
4. Ensure you have a .env file similar to .env.example, with the variable VITE_DATAVERSE_BACKEND_URL=http://localhost:8000.
5. Navigate with cd dev-env.
6. Start the environment using ./run-env.sh unstable.
7. To verify the environment, visit http://localhost:8000 and check your local Dataverse installation.

Step 2: Test the feature

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Yes.

Is there a release notes update needed for this change?:

Additional documentation:

[coveralls]

coverage: 97.754% (+0.4%) from 97.315%
when pulling 536d4d1 on feat/568-featured-items
into 66fd102 on develop.