Add support for dependency injection

[Kaliumhexacyanoferrat]

As a developer of a web application, I would like to use dependency injection for my services and controllers, so that I do not need to resolve all dependencies manually.

Example

using GenHTTP.Modules.DependencyInjection;

layout.AddService<MyClass>(); // resolves dependencies of MyClass when creating the instance

Acceptance criteria

• The functionality is implemented decoupled from the existing logic and put into a new module
• The functionality uses the default way of .NET to resolve dependencies
• The feature is documented on the GenHTTP website
• The feature is covered by acceptance tests