[FEATURE] Enabling Encryption with the SRA

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### Is your feature request related to a problem? Please describe

- Currently, SRA is using SSM parameters for non-sensitive data (e.g., Organization ID, Management Account ID). Having the SSM parameters encrypted, or an option during the deployment would be nice.

- A Customer has a control that requires all SSM parameters to be encrypted by their CMK.

### Describe the solution you'd like

- Implement SSM parameters encrypted despite whether they have sensitive data. Preferably, provide an option for customer to provide the CMK to be used.

- Also, ok with moving to Secrets Manager for encrypted secrets, if that is easier.