Replace axios with fetch global function

[grantholle]

Fetch was added to node v18 without the experimental flag. Deno and Bun both have support for it, so it makes the most sense to refactor to use fetch and release a new major version with v18 of node being the minimum version.

[chadacious]

We have been encountering problems with either axios itself or perhaps it's the request queuing system when running this library in a bun app. There are a lot of intermittent failures where requests just aren't returning. Don't know yet if the queue system is dropping them or if it's an axios thing for not returning anything for some requests.

Have you started work on this refactor at all yet? We didn't notice these issues until we went live with so we are looking at this now.

[grantholle]

I would imagine that it would be Bun + axios but I'm not sure.

I am a bit swamped right now but I don't imagine it would take too much. I'll try to take a look.