- breaks dependency from staged_sync to package with block_reader
implementation
- breaks dependency from snap_sync to package with block_reader
implementation
- breaks dependency from mining to txpool implementation
- allow store non-canonical blocks/senders
- optimize re-org: don't update/delete most of data
- allow mark chain as `Bad` - will be not visible by eth_getBlockByHash,
but can read if have hash+num
* getBlockTransactionCountByHash using snapshots
* got body from block reader
* requesting block body with transactions
* tests
* added tx amount into blocreader body
* using txAmount from body
