modify keyToPath
add comment
add credit
clean up
more clean up
moree clean up
chore
moreee clean up
delete more unused methods
# Conflicts:
# trie/bintrie/expired_node.go
# trie/bintrie/expired_node_test.go
Implement the binary tree as specified in [eip-7864](https://eips.ethereum.org/EIPS/eip-7864).
This will gradually replace verkle trees in the codebase. This is only
running the tests and will not be executed in production, but will help
me rebase some of my work, so that it doesn't bitrot as much.
---------
Signed-off-by: Guillaume Ballet
Co-authored-by: Parithosh Jayanthi <parithosh.jayanthi@ethereum.org>
Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
