Support enum arrays in settings UI

[znck]

A string array type in settings UI is already supported.

I request enum arrays are supported in a similar manner. Example schema from znck.grammarly extension:

 { 
    "grammarly.emotions": {
          "markdownDescription": "**Experimental.** How do you want to sound?",
          "scope": "resource",
          "type": "array",
          "items": {
            "enum": [
              "neutral",
              "confident",
              "joyful",
              "optimistic",
              "respectful",
              "urgent",
              "friendly",
              "analytical"
            ],
            "enumDescriptions": [
              "😐 Neutral",
              "🤝 Confident",
              "🙂 Joyful",
              "✌️ Optimistic",
              "🤗 Friendly",
              "⏰ Urgent",
              "📊 Analytical",
              "🙌 Respectful"
            ]
          },
          "default": []
        },
}

[roblourens]

Duplicate of #77458