Add D benchmark

[Trisfald]

Add a D grpc benchmark.

Library: https://github.com/huntlabs/grpc-dlang

• gRPC server implementation
• Dockerfile to build an image with the gRPC server
• update build.sh, clean.sh and bench.sh scripts

[Trisfald]

I can compile the application, but the server crashes during the test.

Steps to reproduce:

Checkout the branch d-bench.

Build the server with:

docker build --force-rm -f d_grpc/Dockerfile -t d_grpc_test .

Start a container and run the server inside it:

docker run --rm --network host --cpus 1 --name test --entrypoint bash -it d_grpc_test
./server

Perform a client request:

docker run --name ghz --rm --network=host -v "${PWD}"/proto:/proto:ro --entrypoint=ghz infoblox/ghz:0.0.1 --proto=/proto/helloworld/helloworld.proto --call=helloworld.Greeter.SayHello --insecure --duration 1s -d "{\"name\":\"it's not as performant as we expected\"}" 127.0.0.1:50051

Server crashes with this ouput:

2020-07-19 18:54:13 (21) [debug] parseNext - after parseLine =>[pos=16 lim=24 cap=24] - /root/.dub/packages/hunt-http-0.6.3/hunt-http/source/hunt/http/codec/http/decode/HttpParser.d:1325
2020-07-19 18:54:13 (21) [info] onPreface - server received preface: Http2Session@132645144323280{l:127.0.0.1:50051 <-> r:127.0.0.1:33236,sendWindow=65535,recvWindow=65535,streams=0,NOT_CLOSED} - grpc-dlang/source/grpc/GrpcServer.d:64
2020-07-19 18:54:13 (21) [info] onNewStream - server created new stream: 1 - grpc-dlang/source/grpc/GrpcServer.d:69
2020-07-19 18:54:13 (21) [info] onNewStream - server created new stream headers: POST{u=http://127.0.0.1:50051/helloworld.Greeter/SayHello,HTTP/2.0,h=4,cl=-1} - grpc-dlang/source/grpc/GrpcServer.d:70
2020-07-19 18:54:13 (21) [info] onNewStream - server created new stream: 3 - grpc-dlang/source/grpc/GrpcServer.d:69
2020-07-19 18:54:13 (21) [info] onNewStream - server created new stream headers: POST{u=http://127.0.0.1:50051/helloworld.Greeter/SayHello,HTTP/2.0,h=4,cl=-1} - grpc-dlang/source/grpc/GrpcServer.d:70
Segmentation fault