privilege,backupccl: introduce a RESTORE privilege

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#86918
Commit: cockroachdb/cockroach@9f447c5

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Release note (sql change): This change introduces a new RESTORE
privilege that is grantable as a system or database level privilege.
Users can opt-in to the new privilege model by granting the appropriate
privileges as per the following model:

Cluster backups - user requires the system RESTORE privilege

Database backups - user requires the system RESTORE privilege

Table backups - user requires the database RESTORE privilege

In 22.2 we will continue to respect the old privilege model, but will
completely swithover to the RESTORE privilege in 23.1.

Release justification: high impact change to offer fine grained privileges
for bulk operations

Jira Issue: DOC-5505