Add custom Affinity/Anti-affinity configuration

[Gollavilli]

What type of PR is this?

What this PR does / why we need it:

** Allows flexible Scheduling: By Setting Affinity: {}, Improves scheduling control provides more control over pod placement by specifying custom node affinity rules
Fixes #. aws/secrets-store-csi-driver-provider-aws#34

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests

[linux-foundation-easycla]

• ✅login: Gollavilli / (819c71a)
• ✅login: Gollavilli / (819c71a, c992a01)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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