Feature: Support security context (#1437)

[max-allan]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Add support to define (overwrite) SecurityContext for containers & pod security context.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #1437

Special notes for your reviewer:
Fixed version of https://github.com/kubernetes-sigs/secrets-store-csi-driver/pull/1438/files

Moves 'privileged: true' into 'linux.securityContextand does not change thepodSecurityContext` (but there is a value for it, if people want to do that).

TODOs:

• squashed commits
• includes documentation
• [n/a] adds unit tests

[linux-foundation-easycla]

• ✅login: max-allan / (d765a7c)

The committers listed above are authorized under a signed CLA.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: max-allan
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