🚀 Feature: Allow passing in custom fetch imp

[Fractal-Tess]

🔖 Feature description

In the constructor of the client, it would be nice for users to be able to provide their own fetch implementations.

🎤 Pitch

Why?

Because frameworks like SvelteKit, allow prefetching data on the server and exposing the promise to the client. For this to work and to avoid re-fetching twice (on the server and the client), the appwrite SDK client needs to be able to receive the custom sveltekit fetch implementation.
https://svelte.dev/docs/kit/load#Making-fetch-requests

👀 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

[Fractal-Tess]

I'm open to creating a PR for this if the feature is desired.

[ChiragAgg5k]

@Fractal-Tess i like the idea, are there any other implementations where this would be beneficial to the user than the one Svelte provides?

I would also like you to checkout our sdk generator repository. This repo is read only and any changes introduced are first made over there.