(feat): ir now adds a TypeReference for container types that makes it easier to generate snippets + autogenerated type examples

[dsinghvi]

@armandobelardo @amckinney fyi that we basically now add an TypeReference directly on an ExampleTypeReference.

• Improvement: Add TypeReferences to ExampleContainer types, especially helpful in the case of empty container
  examples.
• Improvement: The TypeDeclaration type now has userDefinedExamples in place of the previous example field. It
  also now has an autogeneratedExamples field that will be populated with autogenerated examples in a future PR.