Fixes a regression introduced in #21536

This PR changes several different things:

- Adds test cases for the miner loop
- Stops the worker if it wasn't already stopped in worker.Close()
- Uses channels instead of atomics in the miner.update() loop

Co-authored-by: Felix Lange <fjl@twurst.com>

* cmd/geth: print warning when whisper config is present in toml

* Update cmd/geth/config.go

Co-authored-by: Martin Holst Swende <martin@swende.se>

This adds a new client method BlockNumber to fetch the most recent
block number of the chain.

* core/vm/testdata: add gascost expectations to testcases

* core/vm: verify expected gas in tests for precompiles

* core/vm: fix overflow flaw in gas/s calculation

* cmd, eth: offer maxprice flag for overwritting price cap

* eth: rename default price cap

eth/downloader: only roll back light sync if not fully validating

params: update CHTs for v1.9.21 release

* accounts/usbwallet, signer/core: un-hide accounts from ledger legacy derivation paths

* Update accounts/usbwallet/wallet.go

* Update signer/core/api.go

* Update signer/core/api.go

* whisper: remove whisper

* Update cmd/geth/config.go

Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>

* cmd/geth: warn on enabling whisper + remove more whisper deps

* mobile: remove all whisper references

Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>
Co-authored-by: Martin Holst Swende <martin@swende.se>

accounts: abi/bid/backends; cleaned doc errors, camelCase refactors and anonymous variable assignments (#21514)

Co-authored-by: Osoro Bironga <osoro@doctaroo.com>

* eth: Added TraceTransactionPending

* eth: Implement Trace_Call, remove traceTxPending

* eth: debug_call -> debug_traceCall, recompute tx environment if pruned

* eth: fix nil panic

* eth: improve block retrieving logic in tracers

* internal/web3ext: add debug_traceCall to console

core, eth, trie: prepare trie sync for path based operation

This changes how the downloader works, a little bit. Previously, when block sync started,
we immediately started filling up to 8192 blocks. Usually this is fine, blocks are small
in the early numbers. The threshold then is lowered as we measure the size of the blocks
that are filled.

However, if the node is shut down and restarts syncing while we're in a heavy segment,
that might be bad. This PR introduces a more conservative initial threshold of 2K blocks
instead.

* "Downloader queue stats" is now a DEBUG information

I think this info is more a DEBUG related information then an INFO. If it must remains an INFO, maybe it can be slow down to one time every 5 minutes or so.

* Update queue.go

"Downloader queue stats" information is now provided once every minute instead of once every 10 seconds.

* accounts/abi: fix a bug in getTypeSize method

e.g. for "Tuple[2]" type, the element of the array is a tuple type and the size of the tuple may not be 32.

* accounts/abi: add unit test of getTypeSize method

* tests: add testdata of call tracer

* eth/tracers: return revert reason in call_tracer

* eth/tracers: regenerate assets

* eth/tracers: add error message even if no exec occurrs, fixes #21438

Co-authored-by: Martin Holst Swende <martin@swende.se>

core/state, eth, trie: stabilize memory use, fix memory leak

* go.mod | goleveldb latest update

* go.mod update

* leveldb options

* go.mod: double check

Co-authored-by: Péter Szilágyi <peterke@gmail.com>

* accounts/abi/bind/backends: Disallow timeshift for non-empty blocks

* accounts/abi/bind/backends: added tests for adjust time

* accounts/abi/bind/simulated: added comments, fixed test for AdjustTime

* accounts/abi/bind/backends: updated comment

params: update CHTs for v1.9.20 release

core/rawdb: only complain loudly if truncating many items