add constellation annotations

Description

This small MR adds constellation lines catalog as well as a small catalog holding their names and center coordinates to add annotations to wide fields.

Changes Made

• Added constellations.csv and constellationsnames.csv to data
• Added ra1,dec1 as valid column names for catalogs. And x1/y1 for display

Merge Request Checklists

• Code follows project coding guidelines and its checklist
• I have submitted a MR in the documentation repository if required: siril-doc!108 (merged)
• I have updated Changelog, listing the related issues.