Enriavil1 more generalised prune receipts

Merge branch 'more-generalised-pruneReceipts' of https://github.com/enriavil1/erigon into enriavil1-more-generalised-pruneReceipts

* Move ETL to erigon-lib

* Update link in the readme

* go mod tidy

* Use common/chan.go from erigon-lib

* Clean up

* Fix lint

* Fix test

* Fix compilation

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

fixed bug in stages to refactor the code into two reusable functions PruneTableMultiCursor and PruneTable

(not only rpcdaemon)

Change `Preload headedrs` to `Preload headers`

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

Changed `name if the chain` to `name of the chain`

Signed-off-by: Leonid Yuriev <leo@yuriev.ru>