[FEATURE]: Explore integrating thread pool for callback execution

[evan-palmer]

Is your feature request related to a problem? Please describe

The SerialClient class implements support for callbacks after successfully reading data from the serial port; however, these callbacks are executed in the main thread loop and may take a long time to perform which can result in delays in the serial port IO. If it can be done safely, it may be helpful to implement a thread pool to call on to execute the callback functions.

Describe the solution you'd like

Explore a safe way to implement a thread pool which should be used to execute packet callbacks.

Describe alternatives you've considered

Alternatively, this could be left as-is and require users to ensure that their methods do not take significant amounts of time to complete.

Implementation Ideas

Two approaches might be possible. First, it could be valuable to simply integrate the existing Boost thread pool implementation; however, this will integrate an additional dependency and the usage of Boost is generally discouraged. Alternatively, there may be an easy path forward to implement this by hand. Decisions will need to be made regarding how to design the thread pool if that is the case.

Additional context

• Boost thread pool