Enhancements:
- Enable custom boto3 client parameters for `S3ArtifactStorage` (sbatchelder)
- Return `None` for `run.artifact_uri` if not set (sbatchelder)
- Enable custom contexts for `PytorchLightning` logger (sbatchelder)
Fixes:
- Fix aggregated metrics' computations (mihran113)
- Fix bug in RunStatusReporter raising non-deterministic RuntimeError exception (VassilisVassiliadis)
- Fix tag addition issue from parallel runs (mihran113)
- Handle `StopIteration` exception in iter_sequence_info_by_type method (alberttorosyan)