feat: add experimental `imgOptSequentialRead` config (#72411)
This setting was originally added in PR
https://github.com/vercel/next.js/pull/44881 and then removed in PR
https://github.com/vercel/next.js/pull/65846 however it seems like it
may still be useful in some cases.
The [sharp docs](https://sharp.pixelplumbing.com/api-constructor) are
not very clear:
> false to use random access, true to use sequential reads. Some
operations will do this automatically.
Let's add it back as an experimental setting so we can measure
performance.
