allow for arbitrary grouping of property values and intro PropertyPage

lib/properties/PropertyPage.ts

@@ -0,0 +1,18 @@
+import { PackagePropertyPage } from "../types"
+import { PropertyGroup } from "./PropertyGroup"
+
+export class PropertyPage {
+  private constructor(readonly data: PackagePropertyPage) {}
+  static of(options: {
+    name: string
+    description: string | null
+    groups: PropertyGroup[]
+  }) {
+    return new PropertyPage({
+      type: "page",
+      name: options.name,
+      description: options.description,
+      value: options.groups.map((x) => x.data),
+    })
+  }
+}