Identity provider in Spektate

[samiyaakhtar]

Given an AAD application client id and password we could authenticate. The set up could be as follows:

• Configure Spektate with AAD Identity provider credentials for a tenant
• Run Spektate in your Kubernetes cluster
• Setup an Azure public IP address
• Setup an ingress in your Kubernetes cluster using the public IP address (Your can configure such that only Azure Front Door as access)
• Setup something like Azure Front Door to route to your backend (exposed public IP address)

This way folks can access Spektate security with authorization using Kubernetes to run the workload.

Helps with #167