SO Numbers are not required parameters

[shamseen]

To create a valid SBOL Document for SBOL 2.0, there needs to be a Sequence Ontology number attached.

Currently, users can leave it blank when adding a new part via Eugene.

• Require SO numbers as a parameter (allow for duplicates)
• blanks will map to Engineered Foreign Region: SO_0000805
• If it's common (e.g. Promoter), can take in English text, not numbers.
• Non-blank, non-common term: assume it's a number and add to URI namespace (no validation).
• Mapping unit tests
• Display a warning about default values and duplicates
• Display warning about known part names (e.g. Promoter, Origin_of_Replication, etc).
• Warning unit tests