feat: Add diff module that provides compute_diff, apply_diff_*, DiffSet (#111)

* feat: Add diff module that provides compute_diff, apply_diff_*, DiffSet

* Be explicit in alignment requirement

* Use safer approach avoiding pointer arithmetic

* Impl iter()

* Return better error from DiffSet

Author: snawaz

Cargo.lock

@@ -46,6 +46,8 @@ pinocchio-log = "0.5.0"
 pinocchio = "0.9.2"
 pinocchio-pubkey = "0.3.0"
 pinocchio-system = "0.3.0"
+rkyv = "0.7.45"
+static_assertions = "1.1.0"
 
 [dev-dependencies]
 base64 = "0.22.1"