[burnchain-download] download burnchain blocks in parallel to processing sortitions

[jcnelson]

Right now, the neon run loop downloads all of a reward cycle's burnchain blocks before it begins processing any of their sortitions. It might be possible to download burnchain blocks in parallel to processing sortiitons. We'd need to refactor the main loop in RunLoop::start() so that we only invoke the PoX sync watchdog once the reward cycle has been downloaded, but we could in theory call burnchain.sync() with one block at a time before attempting to process any stacks blocks. Will need to test the feasibility of this.

[jcnelson]

Fixed in #2989

[blockstack-devops]

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