Add @api stable annotations for GeoJSON format
Add @api stable annotations for GML format
Add @api stable annotations for GPX format
Add @api stable annotations for KML format
Add @api stable annotations for OSMXML format
Add @api stable annotations for Polyline format
Add @api stable annotations for TopoJSON format
Add @api stable annotations for WFS format
Add @api stable annotations for WKT format
Add @api stable annotations to olx.format.ReadOptions
Add @api stable annotations to olx.format.WriteOptions
Add @api stable annotations to Feature format
Merge pull request #2629 from elemoine/apistable-format

Add @api stable annotations to ol.format