ASP.NET Core Receiver Middleware

[tsutomi]

Changing the design and behavior of the Webhook Receiver packages

• Removal of the Deveel.Webhooks.Receiver package - This was implemented to be used with the System.Net.Http library, suited mostly for sending messages
• Redesign of the Webhook Builder - The webhook receiver builder is now a class that implements the builder patterns in fully, and that can be instantiated
• New Webhook Receiver Design - The process of receive of the webhooks has been totally redesigned, to focus only on the capabilities offered by the Microsoft.AspNetCore libraries, and implementing a new logic of receive and handling, keeping the rwo processes separated
• ASP.NET Core Middlewares - A new set of middlewares to handle webhook requests from external sources, by simply appending the process in the application pipeline
• Enhanchement of the Documentation - The GitHub documentation and the code documentation for the Deveel.Webhooks.Receiver.AspNetCore functions has been produced or greatly improved