PostgreSQL 16 Beta 1 release announcement draft

Hi,

Attached is a draft of the release announcement for PostgreSQL 16 Beta 
1. The goal of this announcement is to get people excited about testing 
the beta and highlight many of the new features.

Please review for inaccuracies, omissions, and other suggestions / errors.


Please provide feedback no later than May 24, 0:00 AoE. This will give 
me enough time to incorporate the changes prior to the release the next day.

Thanks,

Jonathan