add datasetName to occurrence editor

[ljwalker]

DatasetName can be useful for labelling subsets of records within your collections dataset, as well as for searching on groups of records in aggregators.

Sample values:

• EPICC TCN (NSF 1503065)
• PCC TCN (NSF 1802504)
• Fossil Insect TCN (NSF 1305066)

Would other collections find this term useful?

[ljwalker]

Macroalgae admin Matt Chansler (MSU) expressed support for this request during the Macroalgae portal campaign.