No way to access headers in batch response

[meum]

Is your feature request related to a problem? Please describe the problem.

I'm trying to log the Date, request-id and client-request-id headers returned from the api, to follow best practices described here: https://learn.microsoft.com/en-us/graph/best-practices-concept#reliability-and-support

When using batch requests, the results are in the BatchResponseContentCollection class. There does not appear to be any way to access the headers in this class without using reflection.

Describe the solution you'd like.

A Header or AdditionalData property added to BatchResponseContentCollection, which contains at least Date, request-id and client-request-id

Additional context?

[shemogumbe]

Potentially related to microsoftgraph/msgraph-sdk-dotnet-core#871