[8.x] Extended link to include Product and Category Runway models

[kevinmeijer97]

Added an extend to the link field to register the Product and Category Runway models so they can be used in the link field.

Normally Runway models would automatically be registered, but since the Product and Category models aren't your default Runway models this was not possible so we had to register and resolve the urls like this instead.

[royduin]

Related to:

• Support within the "link" field and entry linking within navs statamic-rad-pack/runway#271
• [9.x] Add resources to the Link fieldtype statamic-rad-pack/runway#838
• [6.x] Add support for custom link types statamic/cms#15004

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• Do we still need the determineEntryUrl()?
• Do we need to raise the versions of Statamic and Runway in the composer.json as this is feature was recently added?
• With this we can just use $item['url'] everywhere? We don't need things like this:

<a href="{{ isset($item['product']->value()['url']) ? '/'.$item['product']->value()['url'] : $item['url'] }}">

[kevinmeijer97]

• Yes, for now we still need determineEntryUrl() as it is used for nav trees. Changing this to work with the models is possible but would create some breaking changes. If we really want that i'd suggest to create a separate PR for this, some type of migration script would be nice to have here as well. The same goes for Can we just use $item['url'] everywhere?
• I bumped the versions to "statamic/cms": "^6.26" & "statamic-rad-pack/runway": "^9.6"