[Feature Request] Enable Azure.Identity to benefit from MSAL.NET token cache when used for Managed identity

[chlowell]

Copied from AzureAD/microsoft-authentication-library-for-dotnet#3137:

Is your feature request related to a problem? Please describe.
Azure.Identity (Azure SDK) is using MSAL.NET for some flows, and in that case it benefits from MSAL.NET cache. But in other cases, it goes directly to the MSI endpoint, and does not cache the token.
The ask is to have a way for the Azure SDK to benefit from MSAL.NET cache

Describe the solution you'd like
The spec is here

Describe alternatives you've considered
See the spec

Additional context
This will be a consistency item,