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Introduces AnnotationProcessingUtils, which provides:
- AnnotationExtractor, a class allowing to retrieve one or many
annotations in reverse declaration order from a class or a test
description
- AnnotationProcessor, a rule to simplify the use of the above
extractor in the context of tests (here used as parent for @Features
rule).
- Utility methods to simplify the use of the above extractor in other
contexts (here used in SkipChecks)

Bug: 783160,754778
Change-Id: I8ca0793e1229c6268266c75791a44615b8f93f57
Reviewed-on: https://chromium-review.googlesource.com/789192
Commit-Queue: Nicolas Dossou-Gbété <dgn@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520789}