EPIC: Run Logs (Support capturing stdout and stderr of training processes)

[diggerk]

Aim has a nice feature of capturing stdout and stderr of training processes, with Aim UI showing it on the "Logs" tab of a run. It'd be nice to support it.

MLflow doesn't currently support this, although many people asked for it, see this feature request: https://github.com/mlflow/mlflow/issues/863

• [x] #1253
• [x] #1254
• [x] #1255
• [x] #1256

[asavpatel]

this would be a really helpful feature, any idea when can we expect this?