Check for unicode minus signs

[kelle]

A common challenge with source and alt names is that they include a unicode minus sign. Consider sanitizing source and other_names to replace the unicode with -.

source_string.replace("\u2212", "-")

Could be relevant for source names and/or JSON file creation.

Also going to make this modification on astrodb_utils for the ingest_source and ingest_namefunctions. astrodbtoolkit/astrodb_utils#109