Add PodSecurityPolicy

[bondar-pavel]

What this PR does / why we need it:

Some environments enforce PodSecurityPolicy checks and deployment fails if objects PodSecurityPolicy, ClusterRole and ClusterRoleBinding are not declared.

This commit adds PodSecurityPolicy, ClusterRole and ClusterRoleBinding objects and adds new configuration option podSecurityPolicy, which is disabled by default.

Which issue this PR fixes

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.

• [ ] Chart Version bumped
• [ ] e2e tests pass
• [x] Variables are documented in the README.md
• [ ] Chart tgz added to /docs and index updated

[willholley]

closing as stale