added raw format in order to return unformated guzzle response

[happybunnyz]

Hey there,
small pull request to introduces the option to retrieve the raw Guzzle response by adding format = 'raw'.

[omniphx]

Hi @happybunnyz, haven't tested this out in a while but you should be able to get a raw response using none: https://github.com/omniphx/forrest?tab=readme-ov-file#raw-response-output

If it's not working as intended, I'm happy to merge this in for you

[happybunnyz]

Thank you for the response. I've just tested it again.

The none option will return only the body/content of the Guzzle response but unformatted only.
It still strips the headers and other parts of the Guzzle response.

For my project, I need to retain the headers for logging purposes.