[_fe_analyzer_shared] Add TestEnvironment for exhaustiveness testing This replaces the StaticTypeImpl with an implementation of the shared exhaustiveness classes for a test type system. This will ensure that the unittests test the shared part of the code and make it easier to handle for instance fields on Object and non-interface types. Change-Id: I101cdd41cf86b2847bd5959c15d4138640e34679 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/282882 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Paul Berry <paulberry@google.com>
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