Metadata 4.6 - Bolognese Updates - Add support for new controlled list values

[ashwinisukale]

• Add support for new controlled list values in readers/writers.
• Add support for new controlled list values in metadata conversions as given in (Bolognese Schema 4.6 Mappings) (Here: https://github.com/datacite/bolognese/blob/master/lib/bolognese/utils.rb)