Add Transport to support more communication protocol extensions #2437

Job	Run time
clang-compile-with-bazel	11m 40s
gcc-compile-with-make-protobuf	16m 57s
compile-with-make	14m 35s
clang-compile-with-make-protobuf	19m 25s
gcc-compile-with-boringssl	11m 37s
gcc-compile-with-bazel-all-options	11m 46s
compile-with-cmake	16m 6s
gcc-compile-with-bazel	10m 59s
clang-unittest-asan	21m 3s
clang-compile-with-boringssl	16m 7s
clang-compile-with-bazel-all-options	16m 31s
bazel-bvar-unittest	17m 35s
clang-unittest	20m 47s
	3h 25m 8s

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