🚀 Feature: Replace cross-fetch with fetch

[Timo]

🔖 Feature description

Replace the cross-fetch library with the native browser fetch Implementation

🎤 Pitch

I want to call a cloud Function using the SDK in a chrome extension service worker. However chrome extension service workers do not support XHR Requests, only the native fetch API

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct

[Eldad A. Fux]

We're working on a fix here: appwrite/sdk-generator#799

[Steven Nguyen]

Closing as a duplicate of #53