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This makes reading the docs much easier as it's clear what's "private" and
what's not.

fixes #238

* feat: parallelize reads

* feat: concurent engine task workers and concurrent bstore reads

* fix: lint

* fix: address review comments

* refactor: in BlockstoreManager wait for process.Closing() instead of Context.Done()

* fix: use channel size 0 for BlockstoreManager reads

* fix: change blockstore error logs from warnings to errors

* fix: flaky test

* fix: lint