Leaf implementation using serde::{Serialize, Deserialize}
To be used as a derive macros attribute #[tree(with=leaf)].
#[tree(with=leaf)]
TreeSchema::SCHEMA
TreeDeserialize::deserialize_by_key()
TreeAny::mut_any_by_key()
TreeDeserialize::probe_by_key()
TreeAny::ref_any_by_key()
TreeSerialize::serialize_by_key()