* Switch stream type of ActiveSession to EthStream
* Start `StatusBuilder` for initializing the `Status` message required
for the handshake
* Add `Hardfork` for `Status` default forkid
* Add `MAINNET_GENESIS` constant
* finish `StatusBuilder`
* initialize eth streams in session
* add status, hello, and fork filter to session manager
* fix status builder example
* add status and hello to network config
* will probably remove
* removing status and hello from networkconfig
* move forkid to primitives
* change imports for forkid
* add hardfork to primitives
* remove hardfork and forkid from eth-wire
* fix remaining eth-wire forkid references
* put mainnet genesis in constants, remove NodeId
* replace NodeId with PeerId
* the only NodeId remaining is inherited from enr
* PeerId still needs to be documented
* also run cargo fmt
* replace loop with iter().any()
* ignore missing docs for hardforks
* use correct PeerId for Discv4::bind example test
* document PeerId as secp256k1 public key
* cargo fmt
* temporarily allow too_many_arguments
* the authenticate and start_pending_incoming_session methods have many
arguments, we can reconsider the lint or fix the methods at a later
point
