Initial work on outlining the dynamic side of the library.

src/dynamic_data/libraries/battle_stat_calculator.rs

@@ -0,0 +1,5 @@
+use crate::dynamic_data::models::pokemon::Pokemon;
+
+pub trait BattleStatCalculator {
+    //fn is_critical(attack: &ExecutingMove, target: &Pokemon, hit: u8);
+}