This TODO:
Fragments could be sent from byzantine nodes.
We need to verify that:

1. Every transaction certificate is valid
2. the certs includes all missing certs on either side

You see, moodycamel::BlockingConcurrentQueue spins here before going to kernel semaphore
and although it's preferable for maximum throughput in benchmarks,
it wastes CPU cycles in some real-life scenarios.

Since [this commit](https://github.com/cameron314/co

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