Feature/add sa

[jungrae-prestolabs]

Propose:
Since there are many kafka connectors that connect to aws, I thought it would be good to support IRSA as a template, so I created the PR.

ref.

• https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html
• https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#use-the-default-service-account-to-access-the-api-server

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[karthikeyanas]

There seem to be some common stuff with https://github.com/confluentinc/cp-helm-charts/pull/600/files