feat: add parse_kv_pairs function to sessions utils

Author: DeanChensj

src/google/adk_community/sessions/utils.py

@@ -35,3 +35,13 @@ def _json_serializer(obj):
     if isinstance(obj, Decimal):
         return float(obj)
     return str(obj)
+
+
+def parse_kv_pairs(data: str) -> dict:
+    """Parses comma-separated key-value pairs into a dictionary."""
+    result = {}
+    parts = data.split(",")
+    for part in parts:
+        key, value = part.split(":")
+        result[key.strip()] = value.strip()
+    return result