[K8SPSMDB-850] Add support for Server Side Encryption for backups

[spron-in]

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Tell us about the feature

Percona Backup for MongoDB supports Server Side Encryption with AWS KMS and with keys stored on the client side:

[https://docs.percona.com/percona-backup-mongodb/details/storage-configuration.html#server-side-encryption]

 

There are also questions on the forum about this functionality: [https://forums.percona.com/t/unable-to-define-a-service-account-for-replica-set-or-sse-for-s3-backups/19798]

 

Operator should support this as well to close the parity gap.

Link to JIRA

[mertgonul]

I have submitted a pull request for SSE and SSE-C support. I have tested SSE-C backup and restore on multiple object storage providers and everything seems fine.

https://github.com/percona/percona-server-mongodb-operator/pull/1198