Sockets aren't 100% reliable on macOS

[bell-db]

#367 switched the plugin communication to TCP sockets on macOS. Unfortunately, it's later found that sockets aren't reliable either out-of-the-box on macOS.

TCP sockets

Details: #381

• The allocated port might be used by other programs.
• nc (invoked from Bazel) might trigger a security pop-up or fail due to Operation not permitted.

Domain sockets

Details: #382

• EOF is occasionally lost (unless a server-side read timeout is set).