Re-evaluate the use of FastAPI and uvicorn framework for the forecasting component.

[ema-pe]

The forecaster component (under docker/forecaster directory) is implemented in Python using the uvicorn and FastAPI frameworks. The implementation is really simple, about 100 lines of code. I think we can remove these advanced frameworks and just use a simpler framework (I am not sure if Python has a default HTTP server like Go). This should make the component easier to maintain.