Create a new AnchoredClock anchored to the current time returned by systemClock.
should be a clock that returns the number of milliseconds since January 1 1970 such as Date
should be a clock that counts milliseconds monotonically such as window.performance or perf_hooks.performance
Returns the current time by adding the number of milliseconds since the AnchoredClock was created to the creation epoch time
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A utility for returning wall times anchored to a given point in time. Wall time measurements will not be taken from the system, but instead are computed by adding a monotonic clock time to the anchor point.
This is needed because the system time can change and result in unexpected situations like spans ending before they are started. Creating an anchored clock for each local root span ensures that span timings and durations are accurate while preventing span times from drifting too far from the system clock.
Only creating an anchored clock once per local trace ensures span times are correct relative to each other. For example, a child span will never have a start time before its parent even if the system clock is corrected during the local trace.
Heavily inspired by the OTel Java anchored clock https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/AnchoredClock.java