Added option to set a parent Observation on an existing Observation #35
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without this change in order to e.g. create spans we always need to put an observation in scope so that spans are put in thread local and a child span is being set. That doesn't make a lot of sense when we exactly know what the parent observation is.
with this change we're allowing to set a parent observation direcly on an existing observation. That way we're able to maintain a parent child relationship of observations and of e.g. spans
related to micrometer-metrics/micrometer#3291