[Nakamoto] Emit signer performance data

[zone117x]

Related to signer support in the API & Explorer hirosystems/explorer#1248

The API and Explorer would like to show signer performance, e.g. a record of uptime and slot success rate.

It sounds like some changes in addition to the event emitter may be required:

I think this requires an extension to the NakamotoBlock event: inclusion of which stackers signed off on the block. The FROST protocol doesn't actually make this recoverable, but stacks-core needs this in place anyways to punish non-responsive signers, so it should be easy to add once that's in place.

Note: this is probably a nice-to-have and lower priority compared to the other signer related events.

[saralab]

@AshtonStephens Can you drop in specific details here

[hstove]

I took a look at this today, and I'll admit I'm not quite sure where to start. I can figure out how to add data to the dispatched event, but I'm not sure where (or if) we store signer participation. @kantai any pointers?

[blockstack-devops]

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