add initial changes for PG16 compatibility and pgMonitor 4.10.0 bump

[dsessler7]

Checklist:

• Have you added an explanation of what your changes do and why you'd like them to be included?
• Have you updated or added documentation for the change, as applicable?
• Have you tested your changes on all related environments with successful results, as applicable?
  • Have you added automated tests?

Type of Changes:

• New feature
• Bug fix
• Documentation
• Testing enhancement
• Other

What is the current behavior (link to any open issues here)?
The max postgres version that postgres-operator is currently compatible with is 15. Also, it is set to use pgMonitor 4.9.0.

What is the new behavior (if this is a feature change)?

• Breaking change (fix or feature that would cause existing functionality to change)
  This change will change the max postgres version that postgres-operator can use to 16. Will also be setup to pgMonitor 4.10.0.

Other Information: