* adds finalization support to sc-transaction-pool using MaintainedTransactionPool for finalization events

* adds TransactionStatus::Retracted, notify watchers of retracted blocks, finalized now finalizes, transactions for current finalized -> last finalized block

* adds last_finalized to ChainApi, use generic BlockT for ChainEvent

* fix tests

* Apply suggestions from code review

Co-Authored-By: Tomasz Drwięga <[email protected]>

* tests

* fix tests, docs, lazily dedupe pruned hashes

* fix tests, Cargo.lock

* Apply suggestions from code review

Co-Authored-By: Tomasz Drwięga <[email protected]>

* remove tree_route, last_finalized from ChainApi, add block hash to Finalization and Retracted events

* prune finality watchers

* fix tests

* remove HeaderBackend bound from FullChainApi

* code style nits, terminate stream in finality_timeout

Co-authored-by: Tomasz Drwięga <[email protected]>

* Cleanup transaction pool deps

* Fix it properly

* Fix doc test

* shuffle tests

* update tests

* inc_nonce -> increment_nonce

* instant/manual seal

unbounded queues are evil

Apply suggestions from code review

Co-Authored-By: Robert Habermeier <[email protected]>

add fork tests, docs, remove todos

moar docs

Update client/consensus/manual-seal/src/rpc.rs

Co-Authored-By: Robert Habermeier <[email protected]>

remove unbound generic, parameter, docs, deps, code style changes

Apply suggestions from code review

Co-Authored-By: Tomasz Drwięga <[email protected]>

code style chnges

remove unused deps, remove dep renames, check if block is empty before importing, use ? for error propagation

fix tests

log errors for instant seal

use debug

code style changes, updated copyright dates

use txpool::Pool instead of BasicPool, code style changes

fixed tests

* fix tests

* requested changes from review

* check inherents len

* rebase