Unused imports in generated classes

[RikkiGibson]

azure-libraries-for-java CI is giving Checkstyle errors like the following:

[ERROR] src/main/java/com/microsoft/azure/v2/management/resources/implementation/ResourcesInner.java:[11,8] (imports) UnusedImports: Unused import - com.google.common.reflect.TypeToken.

We need to refine the import checks in the generator so they only add imports when needed.

[RikkiGibson]

Most of these are easy to resolve except java.util.List, which needs to be added only if the sequence type is not from a paging operation.

I've noticed this before too. All of the changes that I'm making right now should make it much easier to only add imports when they are needed.

I'm actually working on this right now.