v2 planning

[earthboundkid]

The package URL for this repo is now wonky between carlmjohnson and earthboundkid due to the user rename. I was thinking there wasn't a good way to fix this, but if the package moves to v2, the module path can be changed without annoying old users who try to upgrade their dependencies and get a module name mismatch error message.

If we move to v2 this, we might as well fix other problems like #81 at the same time.

What else should we clean up as part of v2?

[earthboundkid]

Drop ToHeaders and just have CopyHeaders.

[earthboundkid]

Make BodyJSON etc into a Config.

[earthboundkid]

Remove minitrue and slicex as part of going to Go 1.23 or whatever is out when this happens.

[earthboundkid]

I should make an organization, so this can be a one time transfer.

[earthboundkid]

Do #123 and drop the old functions.

[PhakornKiong]

Would love to see a more explicit way of extracting body of requests when it is considered error.

Related to
#40

[earthboundkid]

This was added with ValidationHandler:

// If we fail validation because the response is a 404,
// we handle the body with errBody instead of regularBody
// for separate processing.
err := requests.
	URL("http://example.com/404").
	ToString(&regularBody).
	AddValidator(
		requests.ValidatorHandler(
			requests.DefaultValidator,
			requests.ToString(&errBody),
		)).
	Fetch(context.Background())