Proto commits in hust-diangroup/ns3-ai

These 5 commits are when the Protocol Buffers files have changed:

Commit:cb66ce8
Author:muyuanshen

check clang-tidy

The documentation is generated from this commit.

Commit:663937f
Author:muyuanshen

remove benchmarking & update readme

Commit:3c4c536
Author:muyuanshen

add cpu cycle benchmarking for rl-tcp

Commit:b6fd74a
Author:muyuanshen

add gym c++ interface

The documentation is generated from this commit.

Commit:602c81d
Author:muyuanshen

renamed low-level interface to msg interface; add new gym files (not working yet)