Add support for remote-execution / caching of turbine actions

Test: Ran a sample turbine action with:
RBE_TURBINE_EXEC_STRATEGY="remote" RBE_TURBINE="true" ... use_rbe m out/soong/.intermediates/external/protobuf/libprotobuf-java-micro/android_common/turbine/libprotobuf-java-micro.jar
and checked in reproxy_log.txt that remote-metadata had status SUCCESS.

Bug: b/156765475
Change-Id: I85c334e6998c6dd2a68460b3580d50fffd900e6f