Refactor db and local-cache code

Separated cwmp and ui code into distinct files to enhance clarity and
maintainability with varied internal data representations.

test/util.ts

@@ -0,0 +1,41 @@
+import ava from "ava";
+import * as common from "../lib/util";
+
+ava("generateDeviceId", (t) => {
+  const space = [" ", "%20"];
+  const special = [";", "%3B"];
+  const cases = [
+    [
+      {
+        ProductClass: "TestProductClass",
+        OUI: "TestOUI",
+        SerialNumber: "TestSerialNumber",
+      },
+      "TestOUI-TestProductClass-TestSerialNumber",
+    ],
+    [
+      {
+        OUI: "TestOUI",
+        SerialNumber: "TestSerialNumber",
+      },
+      "TestOUI-TestSerialNumber",
+    ],
+    [
+      {
+        OUI: `TestOUIWith${space[0]}_${special[0]}2912`,
+        SerialNumber: `TestSerialNumberWith${space[0]}_${special[0]}2912`,
+      },
+      `TestOUIWith${space[1]}_${special[1]}2912-TestSerialNumberWith${space[1]}_${special[1]}2912`,
+    ],
+  ];
+  t.plan(cases.length);
+  for (const c of cases)
+    t.is(common.generateDeviceId(c[0] as Record<string, string>), c[1]);
+});
+
+ava("escapeRegExp", (t) => {
+  t.is(
+    common.escapeRegExp("\\ ^ $ * + ? . ( ) | { } [ ]"),
+    "\\\\ \\^ \\$ \\* \\+ \\? \\. \\( \\) \\| \\{ \\} \\[ \\]"
+  );
+});