Next.js + web support prototype

[avaer]

Fixes #293

This is a prototype of how we might support web environments with this lib, which may not care about the child_process functionality.

Not tested, not to be merged, just an example idea. All I know is that it builds.

This probably probably breaks the lib on actual node BE, so any child_process stubbing would need to be conditional on dev build.

[codeit-ninja]

Great PR, nice work!

Could you also add support for overriding the fetch function? That would let us plug in a framework-specific fetch implementation when available.

[avaer]

Hm, that's a great idea! I haven't needed it but fetch override is definitely something you'd want if the elevenlabs SDK truly supported web envs. I'm sure fetch could be a separate PR.

However, I'm not the guy to be maintaining a separate web-featured copy of the elevenlabs SDK. Although this hack works for me, I don't really know anything about this codebase and I don't have the resources to maintain a fork.

I think the best bet for this kind of thing might be to convince the maintainers that there is a sufficient use case to bring back a lightweight compatible build of this package. Sadly, this does not seem likely at the current moment.

[codeit-ninja]

Yeah, I opened an issue requesting this feature, they were quik, they have implemented it already and marked the issue as fixed haha. So you can ignore the comment.

#311