Add draft spec text

[jasnell]

No description provided.

[github-actions]

The rendered spec for this PR is available at https://tc39.es/proposal-typedarray-findwithin/pr/5.

[bakkot]

LGTM other than comment. I think later we might want to either define an AO for "SameValueZero-equal" or at least rephrase and put it somewhere which can be shared, but it's fine for now.

Also I continue to think these should all take an offset parameter, but that can be a followup.

[bakkot]

Oh, and I also (weakly) still think the needle should be any iterable, which will be much more annoying to specify. But again, that can be a followup if that's the direction we decide to go.

[ljharb]

why "search" and not "indexOf"?

[jasnell]

indexOf already exists and I didn't want to overload it. 'search' is at least parallel with String.prototype.search but obviously doesn't have the regexp argument. 100% open to more suggested colors for the bikeshed here, just don't want to overload any of the existing method names