Pool: built-in v2 (#2643)

cmd/integration/commands/stages.go

cmd/integration/commands/state_stages.go

cmd/rpcdaemon/cli/config.go

cmd/rpcdaemon/commands/txpool_api.go

cmd/rpcdaemon/commands/txpool_api_test.go

cmd/txpool/main.go

cmd/utils/flags.go

core/tx_pool.go

eth/backend.go

eth/stagedsync/stage_mining_create_block.go

eth/stagedsync/stage_mining_finish.go

go.mod

go.sum

turbo/stages/mock_sentry.go

turbo/stages/stageloop.go