Release v1.16.0

What's Changed

• Add new PR template by @Josipmrden in #451
• Remove codeowners by @Josipmrden in #452
• Add md5 function along with the procedure by @Josipmrden in #444
• Add set property module by @Josipmrden in #445
• Periodic delete by @Josipmrden in #446
• Fix failing tests by @imilinovic in #459
• Implement date.add by @antepusic in #456
• Fix integration tests by @Josipmrden in #463
• Query execution in mage, module refactor by @Josipmrden in #461

Full Changelog: v1.15.2-memgraph-2.15.2...v1.16-memgraph-2.16