feat: Add unique sequence number for aggregation into supervisor

[robinholzi]

Motivation

We want to be able to average the execution time of pipeline stage executions over multiple pipeline runs to gain more confidence in our results. For that we need sequential identifiers to map the StageLog entries from all logfiles.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.82%. Comparing base (b9e255e) to head (0abed0d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #548 +/- ## ========================================== + Coverage 82.80% 82.82% +0.01% ========================================== Files 217 217 Lines 10157 10163 +6 ========================================== + Hits 8411 8417 +6 Misses 1746 1746 ```

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