Adding the ability to surface the access token used by the connection

Discussed in https://github.com/microsoftgraph/msgraph-sdk-powershell/discussions/2010

^{Originally posted by glennvanrymenant May 15, 2023}
Would it be possible to add the ability to surface the access token used by the connection (Connect-MgGraph).

I prefer to call the Graph API directly (using Invoke-MgGraphRequest rather than the specific cmdlets) but ideally I would like call the Graph API directly with Invoke-WebRequest using the access token of the Graph SDK connection.

Read: I want to piggy-back on the auth part of the module (mainly when leveraging delegated permissions as using the auth of the module is easier than writing and maintaining your own authorization code flow functions).