Add relationships to parent classes

[Vincent Janvid]

Add the following relationships to the parent classes:

RunDevice:
run_metrics: list[RunMetrics]

RunMetrics:
device: RunDevice
sample_metrics: list[SampleRunMetrics]

SampleRunMetrics:
run_metrics: RunMetrics
sample: Sample

Sample:
_new_run_metrics: list[SampleRunMetrics]