Bazel new and noteworthy

Overview of the recent enhancements in Gerrit build tool chain:

• Gerrit project from build perspective
• Extract ElasticSearch Server from Gerrit core
• Manage dockerized external dependencies with TestContainers library
• Support recent Java versions 9, 10 and 11
• Track minimal supported Bazel version in Gerrit tree

David Ostrovsky, Gerrit Maintainer