feat(data_structures): add basic staking tracker with tests

Author: aesedepece

data_structures/src/lib.rs

@@ -38,6 +38,9 @@ pub mod fee;
 /// Module containing data_request structures
 pub mod data_request;
 
+/// Module containing data structures for the staking functionality
+pub mod staking;
+
 /// Module containing superblock structures
 pub mod superblock;