* timer-based logs
* timer-based logs
* delegate progress calculation to user
* delegate progress calculation to user
* delegate progress calculation to user
* clear
* add logs to senders recovery
* use default dir in integration
* more logs
* more logs
* add logging to loader
* use pure tx in etl loading, logs in mutation commit
* clean
* bletter logging and more cleanup
* bletter logging and more cleanup
* increase batch size to 500M
* better batch commit logging
* async fsync
* sync fsync
* sync fsync
* unify logging
* fix corner-case when etl can use empty bucket name
* fix tests
* better logging
* better logging
* rebase master
* remove lmdb.NoMetaSync flag for now
* consistent walk and multi-walk
* clean
* sub tx
* add consistent multi-put
* implement dupsort support in one new cursor method
* clear
* limit incremental step size of stages 5 and 6
* remove limit, make incremental
* remove_load_start_key_from_etl
* switch to "struct of arrays" from "array of structs"
* switch to "struct of arrays" from "array of structs"
Co-authored-by: Alexey Akhunov <akhounov@gmail.com>
```
go run ./cmd/integration reset --chaindata=...
go run ./cmd/integration state_stages -h
go run ./cmd/integration state_stages --chaindata=... --verbosity=3 --block=2_000_000 --unwind=10 --unwind_every=1_000
```
Also, it inherits flags from geth:
```
--pprof.cpuprofile=./cpu.out // to file
--pprof --pprof.port=6060 // launch pprof server
--metrics // sends to prometheus
```
* save state
* txlookup full results
* save state
* save state
* remove experiments
* some fix&lint
* add end key to txLookup and index generation
* change log message
* change log
* fix lint
* lint
* fix test
