[Feature Request] Let apps partition their cache easily

[bgavrilMS]

MSAL client type

Confidential

Problem statement

var app = ConfidentialClientApplicationBuilder.Create(clientId)
                    .WithCertificate(certificate) 
                    .WithAuthority(authority)
                    .WithAzureRegion(azureRegion)
+                    .WithCacheOptions(new() CacheOptions { UseSharedCache=true, CacheKeyPrefix = "some_id"})
                    .Build();

Proposed solution

This should use the new cache extensibility functionality to add a single key like to the access token. It should work for all flows, although it is acceptable to only allow it for AcquireTokenForClient.

Internally, you can use WithCacheKeyComponents({{ "cache_key_prefix" = id }});

Alternatives

No response

[jmprieur]

Would you mind writing the user doc (DevEx) ahead of time? In particular, what would be the impact on distributed caches? are there recommendations to take into account?