chore: Add "typedoc-umlclass" typedoc plugin, to show UML diagrams.

I needed to drop down to typedoc 0.26, as 0.27 dropped support for CommonJS,
as explained in krisztianb/typedoc-umlclass#37.

This does not generate a UML diagram for IQuery and Query - I need to investigate why...

package.json

@@ -63,8 +63,9 @@
     "svelte-preprocess": "^5.0.4",
     "ts-jest": "^29.2.5",
     "tslib": "^2.5.2",
-    "typedoc": "^0.27.3",
+    "typedoc": "^0.26.11",
     "typedoc-plugin-mdn-links": "^4.0.4",
+    "typedoc-umlclass": "^0.10.0",
     "typescript": "^5.0.4"
   },
   "dependencies": {

tsconfig.json

@@ -52,7 +52,8 @@
     "out": "code-docs",
     "gitRevision": "main",
     "plugin": [
-      "typedoc-plugin-mdn-links"
+      "typedoc-plugin-mdn-links",
+      "typedoc-umlclass"
     ],
     "sourceLinkExternal": false
   }