feat(API): media field type

internal/domain/entry/entryData.go

@@ -88,3 +88,13 @@ func UniqueValues(fields []contenttype.Field, data map[string]any) []UniqueValue
 	}
 	return values
 }
+
+func MediaIDs(fields []contenttype.Field, data map[string]any) map[string]uint32 {
+	ids := map[string]uint32{}
+	for _, field := range contenttype.MediaFields(fields) {
+		if id, ok := contenttype.MediaID(data[field.Key]); ok {
+			ids[field.Key] = id
+		}
+	}
+	return ids
+}