feat(chart): add deploymentAnnotations option

[t3mi]

Purpose of this PR

The PR adds configuration option for setting annotations on the deployment objects - useful when integrating with other operators, like Reloader, to automatically rotate webhook deployment on secret change.

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Checklist

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

[google-oss-prow]

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