Implement the ultimate quick pick experience

[bwateratmsft]

No description provided.

[alexweininger]

Tree Item Pick scenarios

These scenarios cover all of the current uses of the Tree Item Picker API (TIP). More common scenarios are sorted to the top.

A. Pick an Azure resource of a specific type (optional create)
Example: "Azure Functions: Deploy to Function App" command must pick a deploy target

B. Pick a child of an Azure resource (optional create)
Example: "Azure Functions: Deploy to Slot" command must pick a slot of a Function App. If one doesn't exist, user should be presented with the option to create one.

C. Pick an Azure resource or Workspace resource
Example: "Azure Storage: Create Queue" command must pick a Storage account in Azure, or an attached (emulated) one

D. Pick a child of an Azure resource or Workspace resource
Example: "Azure Functions: Execute Function Now" command must pick a Function running in Azure, or a Function from a Functions Project in the workspace being run locally

E. Pick an Azure resource (of ANY type) or a child of this resource
Example: "Azure: View in Portal" command must pick any Azure resource or child resource that can be opened in the portal.

[alexweininger]

So far in my initial testing it works well. I had to make a few small changes but the concept is proven for sure. I want to go deeper and make sure we can cover all scenarios I outlined so I will report back next week with those results.

[bwateratmsft]

Changed the base to the api-v2 branch.

[alexweininger]

Just a note: we keep calling this the quick pick experience, but I think "pick tree item wizard" or "tree item picker wizard" is a better name. 😄

[nturinski]

I think I've resolved any open comments that I had. Anyway, looks good to me 👍