Provide a standard that combine EDEK and encrypted data

[clintfred]

As an TSC-enabled app
I want to store the encrypted data and encrypted DEK as a single binary blob
so that data management is simpler for single field encrypted values.

This, of course, is possible today, but since the EDEK might be different lengths based on the tenant's KMS choice a custom header (file format) is needed. To make it easier to store combined data/edek, the SDK could provide utilities to make this easier and standardized.

If this is implemented, open a ticket in https://github.com/IronCoreLabs/tenant-security-client-nodejs

[BobWall23]

Try to come up with a format that we can use across SaaS Shield and Data Control Platform.