Add a basic logger which does not require ports
🚀 Feature
It would be great to have a basic logger that does not require opening ports.
Motivation
At this time, all loggers supported by Lightning requires to use ports. There are some environments where I don't have total control and I cannot open ports. It would be great to implement a logger that could dump the metrics during training, and easily visualize their evolution, without the need to forward a port.
Pitch
As proposed by @justusschock in the slack channel, one could add a basic logger FileLogger that saves metrics into a file (like json) and plots them on a regular basis.
Thank you for the great package !