Add spans around (pre)certificate signing #7707
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This adds custom spans around one of the more important parts of the issuance stack - actually signing the (pre)certificates. We only have automatic tracing right now, so this is just a small step towards adding more customization there.
One specific note: I didn't include the regID in the span attributes, though it is in the nearby log lines. I think that's something we likely want to handle holistically (eg, via baggage propagation) rather than one-off in manual spans like this.