sql: add ZONECONFIG privilege for allowing users to edit zone config at the database level

[jseldess]

PR: cockroachdb/cockroach#43941

From release notes:

Non-admin users can now use the ZONECONFIG privilege to create, edit, and delete zone configurations. [#43941][#43941] {% comment %}doc{% endcomment %}

[awoods187]

privileges zone config https://airtable.com/tblD3oZPLJgGhCmch/viwOj1Qb7D4gjtemc/recCHyCs4TR6kO3gs

[Amruta-Ranade]

Addressed in #7061