Initial implementation of snap sync #2809
Merged
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This is a squashed version of #2763, most of the credits go to @shamil-gadelshin
This implements new sync mechanism that is described in the spec.
There are still usability improvements to be done and it only works from genesis and not later, but it does work and it is a big usability improvement for farmers.
Can be tested with
--state-pruning 140000 --blocks-pruning 256 --sync snap
CLI options.Resolves #2507, closes #2763
Code contributor checklist: