chore: add xhr2 package

[im-adithya]

This should fix the error described in haveno-dex/haveno#1482.

To use:
npm install
npm pack

and install the packaged file in sample app
npm install haveno-ts-0.0.30.tgz
npm run start

You will not see the XMLHttpRequest is not defined error anymore

[woodser]

Thanks for your submission. In the end, this solution provided everything we were looking for: #338

• Uses node-xmlhttprequest which is currently used in the jest tests
• Only imports types to the global object if not present
• Exports the types for clients to use without additional imports
• Ignores type warnings
• Doesn't introduce vulnerabilities (actually fixes the current high severity vulnerability).