CCA - obsolete via warning GetAccountsAsync() in favour of GetAccountsAsync(home_account_id)

[pmaytak]

For confidential client apps, obsolete via warning GetAccountsAsync() in favour of GetAccountsAsync(home_account_id).

[jmprieur]

@pmaytak it seems to me that this is a duplicate of #1967, which BTW is better spec-ed than this issue, as it provides the message, including the aka.ms link ?

[bgavrilMS]

Closing as duplicate

[jmprieur]

FYI, I've updated the description in the duplicated issue.

Proposed spec
in IConfidentialClientApplication, add a new method (with the same signature as in the base interface):

        /// <inheritdoc/>
        [Obsolete("Use GetAccountAsync in web apps and web APIs, and use a token cache serializer for better security and performance. See https://aka.ms/msal-net-cca-token-cache-serialization.")]
        new Task<IEnumerable<IAccount>> GetAccountsAsync()