[AzureMonitorDistro] New Public API for Azure Monitor Distro

[rajkumar-rangaraj]

Usage:

Services.AddOpenTelemetry().WithAzureMonitor();

Services.AddOpenTelemetry().WithAzureMonitor(o =>
{
    o.ConnectionString = "InstrumentationKey=00000000-0000-0000-0000-00000000CODE";
    // Set the Credential property to enable AAD based authentication:
    // o.Credential = new DefaultAzureCredential();
});

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

Azure.Monitor.OpenTelemetry.AspNetCore

[cijothomas]

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