MsalProvider should be built on top of Msal.NET directly instead of Microsoft.Graph.Auth

[nmetulev]

Describe the problem this feature would solve

MsalProvider is currently built on top of Microsoft.Graph.Auth which in itself is built on top of Msal.NET. The toolkit providers should not take a dependency on any Graph packages and avoid the additional overhead by building directly on top of Msal.NET

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[shweaver-MSFT]

This was changed in PR #76.

The MsalProvider now lives in it's own dedicated CommunityToolkit.Net.Authentication.Msal package, built on the official Microsoft.Identity.Client.Extensions.Msal package.