Add `future_sync_value` to the lints sets

[FMorschel]

In 3.10, @lrhn implemented a new Future.syncValue, which is more performant than the base Future.value when the user knows the value is not a Future (from here dart-lang/sdk#57495 (comment)). I've implemented future_sync_value over at dart-lang/sdk#61740.

This is a request to add it to core or at least to the recommended set.

[natebosch]

I'd be happy putting this in the recommended or core set. I don't have a strong opinion on which it should go in, I think it's a fairly minor impact.

[lrhn]

Recommended.
I wouldn't worry about using a package that doesn't satisfy this, which is the bar I set for the core set.

[natebosch]

Decision: recommended