Support AbortController to cancel requests

[jwillinghalpern]

It would be nice to be able to cancel a request made to filemaker, if for example a React useEffect hook initiates a request but the component is then unmounted. We could use the abort controller to tell FMGofer to stop waiting for a response and prevent it from logging the timeout error in the console. I.e. cancel the promise.

Reference article from Fabio: https://spencerfeng.medium.com/create-an-abortable-api-using-abortcontroller-and-abortsignal-d774bed40701