Support to deserialize dates

[javierluraschi]

We deserialize cached data as follows:

const arqueroDeserialize = async (e) => {
  const aq = await arqueroRoot();
  return aq.table(JSON.parse(e.replace(/undefined/g, 'null')).data);
}

We need a mechanism to roundtrip the data type of each column. Otherwise, pipelines with dates, save as strings, and are read back as strings once the pipeline is rerun from cache.