WalletConnect build browsers

As WalletConnect does not build with rollup, this a a webpack browser pre-built which can be used in rollup.

Development

``
npm run-script build
`

`
npm publish --access public
`

Jest environment

Add the following to your setup.js:

`javascript
// WalletconnectV2
import { TextEncoder, TextDecoder } from 'util'
global.TextEncoder = TextEncoder
global.TextDecoder = TextDecoder
``