breaking(): remove legacy code and introduce browser entry

[patricksevat]

The current implementation has several imports which are not browser friendly:

1. require('url') in encoder/index
2. require('querystring') in index
3. require('url') in legacy

This PR fixes those by providing a browser entrypoint which is mostly based on the browser's URL api: https://developer.mozilla.org/docs/Web/API/URL while trying to keep the api and results the same.

That said, there are some breaking changes and behavioral differences:

BREAKING

• Removal of the legacy.js file which was deprecated in v2, more than 5 years ago

Behavorial changes, only applicable to the BROWSER ENTRYPOINT

• .encodeQueryString with multi values behaves differently:

encodeQueryString({
            q1: ['𝌆й', '你ス'],
            q2: ''
        })

• NodeJS: encode to the equivalent of 'q1=𝌆й&q1=你ス&q2=' (note the double q1 param)
• Browser: encode to the equivalent of 'q1=𝌆й,你ス&q2=' (single, comma-separated q1 param)
• invalid URLs are dealt with differently: toNodeUrl('xn--iñvalid.com')
  • NodeJS returns host: 'xn--iñvalid.com',
  • Browser returns: host: '-xn--xn--ivalid-x9a.com'

[patricksevat]

In newer Node versions (I used Node 22), this breaks

[patricksevat]

In newer Node versions, this breaks