Introduce a trace_id based on the Context variables

[ateska]

We need a tool for connecting actions across microservices (or even within micro service).

I want to do that using Context Variables:

1. Set in the web handler
2. Used in the logging as standardised structured data entry

Remarks:

• Introduce a common way how this trace_id is passed across microservices over HTTP (and thru Kafka)
• Remove error uuid from web handler, replace / unify this with trace_id

https://docs.python.org/3/library/contextvars.html