Hi!
I have to pass via a formData for a specific API endpoint.

My problem is :

• https://github.com/elysiajs/eden/blob/main/src/fetch/index.ts#L21-L26 : body is stringified automatically if no content-type is provided
• https://github.com/elysiajs/eden/blob/main/src/fetch/index.ts#L37-L42 : There's no way to remove completely content-type from headers preventing from browser to handle multipart correctly (https://stackoverflow.com/a/39281156)
• https://github.com/elysiajs/eden/blob/main/src/fetch/index.ts#L39 content-type should be spelled as Content-Type, if you want to override the content-type then it will be parsed as JSON because of a different case here https://github.com/elysiajs/eden/blob/main/src/fetch/index.ts#L19

I can open a PR if you want but removing the first might be a breaking change that's why I've open an issue first :D