Add type definitions for IDE service

libs/ide_services/types.py

@@ -0,0 +1,24 @@
+from typing import List
+from pydantic import BaseModel
+
+
+class Position(BaseModel):
+    line: int  # 0-based
+    character: int  # 0-based
+
+
+class Range(BaseModel):
+    start: Position
+    end: Position
+
+
+class Location(BaseModel):
+    abspath: str
+    range: Range
+
+
+class SymbolNode(BaseModel):
+    name: str
+    kind: str
+    range: Range
+    children: List["SymbolNode"]