* all: seperate catalyst package

* eth/catalyst: moved some methods, added docs

* eth/catalyst, les/catalyst: add method docs

* core, eth, les, miner: move common function to beacon package

* eth/catalyst: goimported

* cmd/utils, miner/stress/beacon: naming nitpicks
Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>