Add Fetch API

[hahanein]

Would you be interested in a pull request adding the Fetch API as a standard client?

[gkweb]

Please add 👀

[anymaniax]

Hello guys, you can use a mutator to do that. Just like this.

[meixger]

Very happy with the mutator. Works great with within Nuxt 3!

[gkweb]

There is actually an example of a custom client using fetch in the docs like shared above.

https://orval.dev/guides/custom-client

[hahanein]

A guide for creating a custom client is a lot less convenient than an option. Currently, this makes axios the de facto standard client. It sends a wrong signal to users: Generally, you should be using axios. When really, you probably will not need it. In this day and age Fetch is a great API. In some cases Fetch even supports features axios does not. Like Keep-Alive.

[michalusio]

Agree with @hahanein.
The default options should require no additional packages, and so Fetch should be the default.

[anymaniax]

We could for sure add a fetch client directly but for the moment it cannot be the default client since it would be a breaking change

[melloware]

Fetch was added with this PR: #1353