add bazelrun_java_toolchain attribute to launch service with the java toolchain JVM #172
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Solves #16 effectively. It allows the caller to pass in the label to a java toolchain into the springboot macro. Then, when the user launches the service with bazel run, the JVM will be launched from the toolchain.
Also added support for BAZEL_RUN_JAVA environment variable that will be used before any other options.