v0.15.0

[steveberardi]

• Replaces data backend with DuckDB + Ibis, making plotting 2-3x faster and object lookup up to 10x faster
• Changes default unit of right ascension to degrees (0...360)
• Improves performance of constellation label placement
• Separates the constellation Serpens into two "separate" parts (Cauda and Caput)
• Adds a new "blue gold" style extension
• Adds a new field to the constellation model: star_hip_ids which is a list of hip ids for stars that make up the lines in the constellation
• Dropped support for Python 3.9 (Ibis requires 3.10 or higher)
• Increased minimum required version of GeoPandas to 1.0.1