[#6826] Add CloudAdapter for WebApi

[sw-joelmut]

Fixes #6826

Description

This PR moves configuration classes from AspNetCore integration to Connector. Additionally, it adds CloudAdapter to WebApi integration.

Specific Changes

• Move Configuration* classes from AspNetCore integration to Connector. Additionally, it uses TypeForwardedTo system to avoid duplications and breaking changes.
• Added CloudAdapter class to WebApi integration. Adapted implementation of AspNetCore integration.
• Configuration* classes marked as deprecated in WebApi.
• Added unit tests for the new CloudAdapter class in WebApi.

Testing

The following image shows CloudAdapter with a WebApi bot working.

[BruceHaley]

:heavy_check_mark: No Binary Compatibility issues for Microsoft.Bot.Builder.Integration.AspNet.Core.dll