Display RDMA debug info in macOS app.

[AlexCheema]

Motivation

Often users are running into issues with RDMA. See https://github.com/exo-explore/exo/issues?q=is%3Aissue%20rdma Having some debug info in the macOS app will help to debug these issues.

Changes

Displays output of the following commands in the debug info section of the macOS app:

1. rdma_ctl status
2. ibv_devices
3. ibv_devinfo

Why It Works

It displays RDMA debug info in the debug info section of the macOS app.

Test Plan

Manual Testing

We need to make a new build of the macOS app and check the output under the following conditions:

1. No RDMA enabled.
2. RDMA enabled but no devices connected over TB5.
3. RDMA enabled and devices connected over TB5.