feat: initialize and unseal vault after a crash

[venkatamutyala]

As a System Administrator, I want hashicorp vault to initialize itself after cluster bootstrap and i want it to be unsealed after a vault pod crashes because I don't want to have to manually intervene when it happens.

Acceptance Criteria:

• Do not leverage kms unseal options that are cloud-specific as this creates cloud-specific lock-in (something we want to avoid)
• Have an app that unseals the vault and stores the unseal keys into the tenant S3 bucket
• Have the same app, or another service that leverages the unseal keys from the tenant s3 bucket to unseal the vault store after any vault pods crash.
• Add back to this repo as an ArgoCD application