The V1 table structure shows great improvements in performance, but if
there's an old `kvstore` without rowid:s, these benefits are nullified:
reorgs during writes and deletes remain expensive (even if the
degradation is reduced somewhat).
This PR creates the tables in a new file instead, and uses the old file
as a read-only store - this has several interesting properties:
* the old database is left completely untouched - this guarantees that
downgrades work smooth (they'll only need to resync their missing
portions)
* starting sync after this PR means only a v1 database is created
* v0 databases stick around - no migration is performed (for now)
Future PR:s can introduce migration of the data from one database to
another - a simply copy will take hours which is downtime we want to
avoid - at that point, it might make sense to migrate straight to era
files instead.
* use StateData in place of BeaconState outside state transition code
* propagate more StateData usage
* remove withStateVars().state
* wrap get_beacon_committee(BeaconState, ...) as gbc(StateData, ...)
* switch makeAttestation() to use StateData
* use StateData wrapper/dispatcher for get_committee_count_per_slot()
* convert AttestationCache.init(), weak subjectivity functions, and updateValidatorMetrics()
* add get_shuffled_active_validator_indices(StateData) and get_block_root_at_slot(StateData)
* switch makeAttestationData() to StateData
* sync AllTests-mainnet.md after rebase
* add doppelganger detection explanation to FAQ and link to Joe's guide from our Pi guide
* Edit CLI options page
* cp
* merge with ith unstable
* prysm migration guide: add steps until import slashing db
* update systemd
* update troubleshooting
* update pi guide
* metrics: replace winners with community
* update migration guide
* cp
* progress with guides, various edits
* Error when specifying an invalid --data-dir (or --validator-dir)
* Error when entering an invalid validator public key (e.g. invalid hex value)
* Warning when attempting to export a validator not present in the local database
Some unnecessary remains of the v1 mode has been removed as well
* Revert "Revert "Upgrade database schema" (#2570)"
This reverts commit 6057c2ffb4a481d3994c8fe5a46e7b754d12ae8f.
* ssz: fix loading empty lists into existing instances
Not a problem earlier because we didn't reuse instances
* bump nim-eth
* bump nim-web3
