Generate stubs for ACF PRO 6.2.7

What's Changed

• Add function mapping and update stubs by @juhojama in #10
• Generate stubs for ACF PRO 6.1.8 - 6.2.7 by @juhojama in #11

New Contributors

• @juhojama made their first contribution in #10

Full Changelog: v6.1.7...v6.2.7