[Feature Request]: Add log warnings for deadlock prevention

### What would you like to happen?

It would be useful to add some log messages when a transform fills its Input Buffer, but can't empty its Output Buffer (tipical symptom of a deadlock).

You can actually notice this if you're executing a pipeline in Hop GUI, but can't tell this so easily if you're running in a non-graphical environment (e.g. Hop Run), or even if the deadlocked pipeline happens to be a "nested" one (injected pipelines and sub-pipelines are not well traced even in Hop GUI).

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Run, Component: Pipelines, Component: Transforms, Component: Hop Gui

Start by tracing how pipeline transforms detect a full Input Buffer alongside an uncleared Output Buffer, then check how Hop Run and Hop GUI currently surface pipeline state. Done means a useful warning is emitted for this condition, including enough context to identify the affected transform in non-graphical and nested pipelines.

Written by the indexing model from the issue text.