Add dataset validity information when necessary

[dosse]

When using includeHistory, the resulting SDMX-CSV is not fully useful without the dataset validity (time span) information. There should be related standard columns for this.

Also note that the action Information was deprecated. Line

sdmx-csv/data-message/docs/sdmx-csv-field-guide.md

Line 46 in 9a65b13

- The header field of the next column should contain the term `ACTION`. For convenience, if this column is not present, a default action ("Information") is assumed for the whole message.

should be updated accordingly.