feat: Add in some helpers for the properties

lib/properties/Properties.ts

@@ -0,0 +1,36 @@
+import {
+  PackagePropertiesV2,
+  PackagePropertyObject,
+  PackagePropertyString,
+  Properties as P,
+} from "../types";
+import { PropertyObject } from "./PropertyObject";
+import { PropertyString } from "./PropertyString";
+
+export class Properties<X extends PackagePropertiesV2> {
+  constructor(readonly data: X) {}
+
+  static of<
+    X extends Record<
+      string,
+      | PropertyObject<PackagePropertyObject>
+      | PropertyString<PackagePropertyString>
+    >
+  >(x: X) {
+    const answer = {} as {
+      [key in keyof X]: X[key]["data"];
+    };
+
+    for (const [key, value] of x.entries()) {
+      answer[key] = value.data;
+    }
+    return new Properties(answer);
+  }
+
+  build() {
+    return {
+      version: 2,
+      data: this.data,
+    } satisfies P;
+  }
+}