Provide condition to show month in date of pubid edition year

[ronaldtse]

From @Intelligent2013:

IEC pubids support representation of month as well in this format:

• "IEC 60794-1-23:2019-10"

There will need to be an option to render:

• only year
• year and month

Originally posted by @ronaldtse in https://github.com/metanorma/metanorma-iec/issues/154#issuecomment-1293574126