v0.18.0

Documentation 📖

• Fix directed_hausdorff_distance space_offsets name + documentation (#332) @cwharris

New Features 🚀

• New build process script changes & gpuCI enhancements (#338) @raydouglass

Improvements 🛠️

• Update stale GHA with exemptions & new labels (#357) @mike-wendt
• Add GHA to mark issues/prs as stale/rotten (#355) @Ethyling
• Prepare Changelog for Automation (#345) @ajschmidt8
• Pin gdal to 3.1.x (#339) @weiji14
• Use simplified rmm::exec_policy (#331) @harrism
• Upgrade to libcu++ on GitHub (#297) @trxcllnt