feat: defined a base template to create all handlers

src/lexer/handler/base.py

@@ -0,0 +1,15 @@
+from abc import ABC, abstractmethod
+from ..state import LexerState, Position
+
+class TokenHandler(ABC):
+    """Base class for all token handlers."""
+
+    @abstractmethod
+    def can_handle(self, state: LexerState) -> bool:
+        """Check if the handler can process the current character."""
+        pass
+
+    @abstractmethod
+    def handle(self, state: LexerState, start_pos: Position) -> None:
+        """Process the token and update state."""
+        pass