Add new disableRequest option to perform fetch with a bare URL

[cuibonobo]

This PR allows passing the URL directly to the fetch function without creating a Request object first. With these changes, we don't get an ERR_INVALID_URL error when using non-fully-qualified URLs like /foo.

A side effect of the disableRequest option is that the AxiosResponse object will only have this URL in its request property. This means that accessing, for example, response.request.url will throw an error.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9fd0852) 100.00% compared to head (eb74460) 100.00%.

Additional details and impacted files

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##              main       #12   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines           96        97    +1     
  Branches        32        34    +2     
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+ Hits            96        97    +1     

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