[APIView] Auto API Views from PRs should add Samples

When an API View is automatically created from a new PR being opened in one of the language repos, if the PR contains changes to the library's samples, those should be added to the API View listing in the samples tab.

Start by tracing how an API View is automatically created when a PR opens in a language repository, then follow the handling of changes to library samples and the samples tab listing. Done means sample changes from a new PR are detected and those samples appear in the generated API View.

Written by the indexing model from the issue text.