refactor: add base parse module

gallery/sketch/parse/core.py

@@ -0,0 +1,13 @@
+from typing import Generic, TypeVar
+
+D = TypeVar("D")
+R = TypeVar("R")
+
+
+class ParseError(Exception):
+    pass
+
+
+class Parser(Generic[D, R]):
+    def parse(self, data: D) -> R:
+        raise NotImplementedError