* Ported HeaderPropagation from aspnet/Extensions
* Introduced Middleware
* Refactored middleware logic
* Refactored builder extensions
* Copyright notice
* Test for friendly exception on Builder
* Fixed header name selection when no output name specified
* Set comparer for the dictionary of headers
* Refactored configuration as Dictionary
* Renamed state objects
* renamed OutboundHeaderName in configuration
* Changed DefaultValuesGenerator to ValueFactory
* Missing docs
* Removed AlwaysAdd and added tests for null entry in configuration
* Improved docs
* Update src/Middleware/HeaderPropagation/src/DependencyInjection/HeaderPropagationExtensions.cs
Co-Authored-By: alefranz <alessio@franceschelli.me>
* Moved dependency injection extensions
* DI: reused ServiceCollection extension in the HttpClientBuilder one
* Moved service registration
* Update src/Middleware/HeaderPropagation/src/HeaderPropagationEntry.cs
Co-Authored-By: alefranz <alessio@franceschelli.me>
* more docs
* Improved docs
* Update src/Middleware/HeaderPropagation/src/HeaderPropagationValues.cs
Co-Authored-By: alefranz <alessio@franceschelli.me>
* Fixed build
* Update eng/SharedFramework.Local.props
Co-Authored-By: alefranz <alessio@franceschelli.me>
* Updated tests for null config
* Reversed condition on HeaderPropagationMessageHandler as suggested
* Added docs for HeaderPropagationMessageHandler
* Changed proj to ship package to NuGet
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