Use provided `AbortSignal` or omit it from `initialOptions` type definition

There would be better to allow use also original Abort Signal (if provided):

use-x/src/use-fetch/use-fetch.solution.ts

Lines 95 to 96 in ca70f15

    
           const requestInit = (requestOptions || {}); 
        
           requestInit.signal = abortController.current.signal;

 	 const requestInit = (requestOptions || {}); 
	 requestInit.signal = requestInit.signal ? mergeSignals(requestInit.signal, abortController.current.signal) : abortController.current.signal;

…using https://www.npmjs.com/package/abort-utils

Thanks! I will add this and a test soon. Will use the new built in AbortSignal.any() - https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/any_static

	const requestInit = (requestOptions \|\| {});
	requestInit.signal = abortController.current.signal;