Is your feature request related to a problem? Please describe.
Azure provides now a way to authenticate towards AppIns via a service principal. I was always suprised why they didn't provide something like this sooner, but hey :).

Now it is supported I want to leverage from this via Arcus.
When setting up your sink, there should be a way to set this authentication.
More information on the tool itself: https://learn.microsoft.com/en-us/azure/azure-monitor/app/azure-ad-authentication?tabs=net.

Describe the solution you'd like
There are two ways we can handle these things...

We now have in the sink startup WriteTo.AzureApplicationInsightsWithConnectionString, where we could add an overload parameter with tokenCredential (so you can choose managed identity or service principal).

Or we add an extension method on top of WriteTo.AzureApplicationInsightsWithConnectionString, with name similar to 'UsingAuthenication('TokenCredential credential).

Describe alternatives you've considered
There are no real alternatives, I am a bit stuck as I cannot use the Serilog sink as it doesn't do the convertions.

Additional context
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