* merkle-tree: Add Xargo.toml
(cherry picked from commit a1d9b53cd7)
* merkle-tree: Get `Hash` et. al from program instead of sdk
(cherry picked from commit ddc0a16cec)
* merkle-tree: Use `matches` crate when targeting eBPF
(cherry picked from commit a44c32694f)
Co-authored-by: Trent Nelson <trent@solana.com>
