Ensure {CREATE|ALTER|DROP} PLACEMENT POLICY requires the PLACEMENT_ADMIN privilege

[AilinKid]

This is a sub-task of Placement Rules in SQL: #18030

Support the ability to CREATE PLACEMENT POLICY with the same options available in CREATE TABLE|ALTER TABLE context.

The following subtasks are known:

• Ensure {CREATE|ALTER|DROP} PLACEMENT POLICY requires the PLACEMENT_ADMIN privilege
  • Require CREATE PLACEMENT POLICY with PLACEMENT_ADMIN
  • Require DROP PLACEMENT POLICY with PLACEMENT_ADMIN
  • Require ALTER PLACEMENT POLICY with PLACEMENT_ADMIN

[sylzd]

It seems the issue can be closed by one pr.