codetracer-python-recorder/src/tracer.rs: Complete the implementation of the Tracer trait. Remove STOP_ITERATION

I seem to be unable to write Python code that would emit the STOP_ITERATION event. I've removed it for now
We added support for all other events in the Tracer trait

Signed-off-by: Tzanko Matev <[email protected]>

Author: tzanko-matev