Create basic test for command-line tools

[gavv]

We have created this repo for various real-time integration tests for public API. See #1 for details.

Among other things, it would be great to add integration tests for our command-line tools. Currently they are not covered with tests, and sometimes a breakage remains unnoticeable for a while.

This issue is for creating the very first test for them, to start with something simple. The test should generate a WAV file, run roc-send to send it to network, and run roc-recv to receive it from network and write to a local file. Then the test should analyze the received file and compare it with the sent one.

Again, see #1 for details on this comparison. The files wont be absolutely identical of course.

To run tools, we could use a library like subprocess. Good libraries for WAV files are dr_wav and libsndfile.

Related docs:

• https://roc-streaming.org/toolkit/docs/running/command_line_tools.html
• https://roc-streaming.org/toolkit/docs/manuals/roc_send.html
• https://roc-streaming.org/toolkit/docs/manuals/roc_recv.html