[FEA] Improve Monitor Stage

[mdemoret-nv]

Is your feature request related to a problem? Please describe.
The MonitorStage currently has several flaws that reduce its usefulness:

1. It has its own buffered queue meaning messages are not tracked as they are processed, but when back pressure forces them to be processed. This delays and alters the measured results
2. It requires a separate python thread to periodically update the screen with the latest results
3. The throughput numbers cannot be queried or displayed anywhere besides the console
4. It does not scale well. If multiple monitors are added, they all redraw and refresh at separate times.

Describe the solution you'd like
Ideally, the MonitorStage would:

1. Immediately track the throughput of the previous stage without any buffering. This would require changing the type of node that is used to a node that does not have it's own progress engine.
2. Be implemented in C++ to avoid grabbing the GIL when monitoring throughput
3. Utilize a common library such as Prometheus to allow extracting the measured values or displaying outside of the console
4. Synchronize updates between multiple instances to avoid scaling issues.

[mdemoret-nv]

Moving to 23.11 since this relies on non-linear pipelines in SRF.