refactor: turn into dual node package with additional browser bundle

[axe312ger]

Requires https://github.com/contentful/contentful-sdk-core/pull/438

• [x] remove node (minified) bundle
• [x] make available in cjs (as bundle for node without ESM support)
• [x] make available in esm
• [x] support ESM only dependencies
• [x] support browser plain + minified
• [x] switch from jest to vitest
• [x] switch to rollup from webpack

Will fix:

• https://github.com/contentful/contentful.js/issues/2131
• https://github.com/contentful/contentful.js/issues/2122
• https://github.com/contentful/contentful.js/pull/2130
• https://github.com/contentful/contentful.js/issues/1873
• https://github.com/contentful/contentful.js/issues/2214

[axe312ger]

Green tests 😱✅

Thank you @mgoudy91 for publishing the updated esm compatible SDK-CORE :)

[mgoudy91]

Looks like there's some conflicts as well, I started taking a look but I think it's going to take more time for me to gain context than I thought. Let me know if you'd like help with that and I can take a look

[axe312ger]

@mgoudy91

1. release: I am not sure how it would release, I think you/we have to do the same as you did here https://github.com/contentful/contentful-sdk-core/pull/438 - but we should release it as new major/breaking version, starting with an alpha version for public testing
2. legacy config: the jest.config is gone
3. legacy commented out code: can't find any commented out code, can you point me to where you did see it?
4. conflicts: resolved!