Implement top-level CLI for executing solvers and dynamically fetching inputs

advent_of_code/solver.py

@@ -0,0 +1,11 @@
+from abc import ABC, abstractmethod
+
+
+class Solver(ABC):
+    @abstractmethod
+    def solve_part_1(self, input: str) -> None:
+        pass
+
+    @abstractmethod
+    def solve_part_2(self, input: str) -> None:
+        pass