Add trace spans to har #20
Merged
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Description
This PR adds trace spans to the HAR under _custom keys. It adds them at the root level, the page level, and the entry level. The fields added are intended to be compatible with https://www.w3.org/TR/trace-context
The intention is to both send them via headers, for apps like new relic, and also to store them in our models, which can then provide observability data to providers like New Relic, and Datadog.