Provide a standard that combine EDEK and encrypted data

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

Start by reviewing the requested combined binary blob for encrypted data and the encrypted DEK, including the variable EDEK length caused by tenant KMS choices. Define the standardized format and utility behavior before implementation, then verify that the resulting blob can be stored and recovered for single-field encrypted values. If implemented, open the corresponding ticket in tenant-security-client-nodejs.

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