Bug 2020855 - add timestamps to breadcrumb data

[bendk]

Also removed the tracing dependency, which was optional and never used. All calls go through tracing-support.

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[mhammond]

I wonder if format might be a better prefix than add? I first expected to see this "add the breadcrumb" and was confused why the caller did the push. Not a bug deal though.

Also, is it at all possible we will want to order or group by timestamps? Should the timestamp maybe be appended instead, maybe inside parens?

[bendk]

I updated the function name and put the timestamp at the end, both of those seem like solid improvements to me. I don't understand the group by timestamp part, how would that work?

[mhammond]

I don't understand the group by timestamp part, how would that work?

Sorry I was unclear - I meant that the timestamp at the end would allow simpler grouping/sorting via the name