Add cors pre flight child span

Adds more attributes to span just before ending it

Add headers

Clears the resource timings and all resources assigned with spans when FetchPluginConfig.clearTimingResources is set to true (default false)

Creates a new span

Finish span, add attributes, network events etc.

Finds appropriate resource and add network events to the span

Marks certain [resource]PerformanceResourceTiming when information from this is used to add events to span. This is done to avoid reusing the same resource again for next span

Patches the constructor of fetch

Prepares a span data - needed later for matching appropriate network resources

implements unpatch function

implements enable function