Enable head-based sampling and add some scripts for large scale deployment

This PR is related to the following issues:

• Head based sampling: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/17
• Data type of duration: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/20
• Docker images and scripts for deployment: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/15

Side note, gen_address.py and config/alibaba_parse.py are not used, will be discarded later.

docker/DockerfileTracer

@@ -93,7 +93,7 @@ RUN cd agent &&\
     go build cmd/agent2/main.go &&\
     mv main /hindsight_agent
 
-RUN --mount=type=ssh git clone --branch zxie git-rts@gitlab.mpi-sws.org:cld/tracing/hindsight-grpc.git /root/hindsight-grpc
+RUN --mount=type=ssh git clone git-rts@gitlab.mpi-sws.org:cld/tracing/hindsight-grpc.git /root/hindsight-grpc
 WORKDIR /root/hindsight-grpc
 RUN mkdir build &&\
     cd build &&\