Export `node-utils` from package.json

Before you lock down TypeDoc for the TSGO7 upgrade...

I have a small request for a custom deployment of TypeDoc where I have some advanced use cases that benefit from access to the runtime node utilities. I need to access discoverAllReferenceTypes. For programmatic deployments it may be useful to simply expose node-utils similar to how the browser-utils has an export of typedoc/browser. This can be accomplished simply by adding the proper sub-path export condition to package.json

{
   "exports": {
      "./node": {
         "typedoc-ts": "./src/lib/node-utils.ts",
         "types": "./dist/types/node-utils.d.ts",
         "default": "./dist/node-utils.js"
      }
   }
}

This allows:

import { discoverAllReferenceTypes } from 'typedoc/node';

At the end of the day... I can simply modify the package.json after TypeDoc installation into my specific project to add the above, but I think this is generally useful for more advanced programmatic use cases in general.

Also just a quick thing I noticed when looking at this enhancement request.. It appears the browser export condition for typedoc-ts is not pointing to the source. IE "typedoc-ts": "./src/lib/browser-utils/index.ts" likely should be "typedoc-ts": "./src/lib/browser-utils.ts", as there is no ./src/lib/browser-utils folder in the latest repo update that I see.