feat(async/unstable): allow AbortableOptions with optional signal in abortable

[lowlighter]

Close #6970

Make it so the abortable() can be called with both of these manners:

await abortable(promise, signal)
await abortable(promise, { signal })

The second one which is introduced, is close to the options object already supported by deadline/delay, making it easier for libraries developpers to reuse the same object by unifying these differents APIs, and also avoiding the burden of checking whether their promise must be wrapped by abortable or not depending on whether the signal is provided or not

async function foo(options: { signal?: AbortSignal } = {}) {
  await delay(100, options)
  await abortable(promise, options)
  await deadline(another_promise, options)
}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.20%. Comparing base (4d438dc) to head (8f0f43f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6971      +/-   ##
==========================================
+ Coverage   94.19%   94.20%   +0.01%     
==========================================
  Files         600      601       +1     
  Lines       43290    43343      +53     
  Branches     6961     6973      +12     
==========================================
+ Hits        40776    40831      +55     
+ Misses       2459     2458       -1     
+ Partials       55       54       -1     

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