Fixes a missing CancelledError async raising on discv5 waitMessage
which would cause "Error set on a non-raising future".
Also moves some more results import away from stew.
`eth_types` is being imported from many projects and ends up causing
long build times due to its extensive import lists - this PR starts
cleaning some of that up by moving the chain DB and RLP to their own
modules.
this PR also moves `keccakHash` to its own module and uses it in many
places.
* Add build_dcli target and add it to CI
* Fix local imports for dcli
* And use local imports for all other files too
* Use local imports in tests and rlpx protocols
* use bearssl rng throughout
* seeder can fail
* imports and exports
* modules, sigh
* one more try
* move var
* even fewer thread vars
* remove out-of-date genrated files
* secp: handle invalid keys better
we can't guarantee with the type system that invalid keys don't exist,
so we have to introduce error handling for it
* avoid mix of exceptions and return codes
* introduce result
* use deprecated compatibility API to avoid big-bang refactoring
* loosely based on nim-libp2p secp as well as the rust-secp256k1 wrapper
* oh, boy does our secp256k1 wrapper need updating - we're _far_
behind...
Kim De Mey
jangko
Justin Traglia
Jacek Sieka
Zahary Karadjov
Yuriy Glukhov