feat: add static Response.json

[KhafraDev]

Purpose

Implements static Response.json from whatwg/fetch#1392

Changes

Adds static Response.json

Additional information

---

• I updated readme
• I added unit test(s)

---

• Fixes Impl "Response.json" #1669

[LinusU]

I think that using init = {} and assuming init is an object further down in the function will make the following code crash:

Response.json({ hej: 1 }, null)

But in Chrome that works:

[KhafraDev]

node-fetch doesn't seem to do much argument validation, I followed other areas of the code.

For example when constructing a new response:

new Response('', null)

throws an error when it shouldn't

new Response('', 3)

works when it shouldn't (same with booleans, etc)

[jimmywarting]

I'm okey with some small deviations, we don't have all the webidl stuff undici have and don't follow the spec at 100%. it was set up to be "good enough" and solve the most common use cases.
We didn't have all the web parts in NodeJS that builds up fetch for what it is today in the beginning when node-fetch was first built, like web streams, blob, formdata, AbortController, etc. so we did compromise a little bit.

it's going to be replaced by NodeJS in the newer versions anyway at some point. node-fetch is just a polyfill at this stage.
it at least gets the job done and i'm sure ppl will get it right 99% of the times.

[LinusU]

Looks great! 👍

[github-actions]

🎉 This PR is included in version 3.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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