[Prism] Fix process timeouts between highlight calls for long building pages #138
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In case a page takes time to build and contains multiple highlight calls,
the time elapsed between 2 calls might be too long and the process might timeout (for instance, if there is a large amount of images to resize in the page).
Instead of using a global timeout for the process, let's use an idle timeout (time without any output) between each highlight call and reset it after getting a response from the Node process.