Ability to use two boost control outputs for two banks and assignable metering sensors

For a hot-vee V8 application, like the N63TU, the engine is split into two separate banks. This means each bank of 4 cylinders has it's own turbo, boost control, EGO, throttle, intake/exhaust manifold, and air metering. As of writing this, FOME only supports a single boost control output. With the addition of a second one, it would also be necessary to be able to associate one of the air metering sensors with one boost control output, and the other sensor with the other output.

Start by tracing the existing single boost-control output and air-metering sensor configuration in the FOME codebase. Determine how outputs and sensors are represented and how two engine banks could be associated independently. Done means both banks can use separate boost-control outputs and each output can select its corresponding metering sensor, with coverage for the new configuration.

Written by the indexing model from the issue text.