feat: add support for repeatable links in models

[levimykel]

Resolves: Repeatable links project

Description

The first of 3 PRs to support an array of links as well as single links. It would allow devs to not manually wrap their link in a Group. It would also allow editors to have a better experience with a dedicated UI for multiple links.

This PR handles the model changes. The model adds a new repeat property to define if the link field is an array or not.

{
  "example_link": {
    "type": "Link",
    "config": {
      "label": "My Button Link",
      "placeholder": "My Button Link Placeholder",
      "repeat": false, // true to activate repetition
      "select": null,
      "allowTargetBlank": false,
      "allowText": true
    }
  }
}

Other PRS:

• 2 - Add support for repeatable link values
• 3 - Support repeatable links in helpers & migration

Checklist

• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

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Footnotes

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[angeloashmore]

Content relationship and link to media fields are included in this PR, but I thought we were only enhancing the link field. If we're allowing it on all link-link fields, let me know and I'll approve it as is.

Everything else looks good. 👍

[angeloashmore]

❓ Are we allowing content relationships to be repeatable? I thought we weren't, but correct me if I'm wrong.

[angeloashmore]

❓ Are we allowing link to media fields to be repeatable? I thought we weren't, but correct me if I'm wrong.

[dani-mp]

@angeloashmore changes applied

[angeloashmore]

Looks good! We can merge and publish when we are ready.