Move authentication to Azure.Identity 📦

[tomkerkhove]

Is your feature request related to a problem? Please describe.
Move authentication to Azure.Identity 📦 so that we don't reinvent the wheel or support it next to what we have today.

[stijnmoreels]

Hmm, is this already supported in Logic Apps? There doesn't seem to be a new library where the Azure.Identity is used to create an alternative to the LogicManagementClient? Or am I missing something.