CoreWCF 0.3.0 Released

Release Notes: https://github.com/CoreWCF/CoreWCF/releases/tag/v0.3.0
Announcement blog post: https://corewcf.github.io/blog/2021/09/13/corewcf-0_3_0_release
GitHub discussion thread: CoreWCF/CoreWCF#443

This release we hit a major milestone. The majority of significant changes have come from community contributions. We have a new package as a result of this, CoreWCF.ConfigurationManager. This brings partial support reusing your app.config from .NET Frmaework. Here are all the new features available in 0.3.0:

* Added partial support for WCF app.config configuration - @Ximik87
* Added non-generic overload of ServiceBuilderExtensions.ConfigureServiceHostBase() - @g7ed6e
* Made HttpsTransportBindingElement public to enable custom bindings using HTTPS - @birojnayak
* Added compat support for System.ServiceModel.XmlSerializerFormatAttribute - @petarpetrovt
* Duplex contracts now work - @Danielku15
* Made FaultContractInfo public - @g7ed6e

Start by reviewing the linked v0.3.0 release notes, announcement blog post, and CoreWCF#443 discussion. This issue records a completed release rather than naming a documentation change, so the scope and definition of done are not specified.

Written by the indexing model from the issue text.