Deprecate JsonContainerDefinitionSerializer

[cspray]

The existing JSON serialization has various issues with the format and needs to be updated to include support for serializing Inject values correctly. In addition, a new XML serializer format is being implemented that can replace the JSON format for caching purposes and is meant to be suitable for uses in static analysis contexts.

It doesn't really make sense for us to provide multiple serialization formats. Serializing a ContainerDefinition is complicated and having multiple implementations is most likely going to lead to pain. Because the XML serializer solves problems that exists in the JSON serializer and will provide other functionality it does not make sense to offer both.