fix: use Z suffix for UTC timestamps and omit null trace_id#4

Polliog merged 1 commit intologtide-dev:mainlogtide-dev/logtide-python:mainfrom

TomatoInOil:fix/datetime-and-null-trace-idTomatoInOil/logtide-python:fix/datetime-and-null-trace-idCopy head branch name to clipboard