fix: parse query_tags string into List[QueryTag] for execute_statement (#359)

The SDK's StatementExecutionAPI.execute_statement() expects
query_tags as Optional[List[QueryTag]], but executor.py passed
the raw string directly, causing:
  'str' object has no attribute 'as_dict'

Parse "key:value,key2:value2" format into QueryTag objects.
Handles edge cases: empty strings, colons in values, spaces,
malformed entries (gracefully skipped).

Fixes #358

Author: yogesh-dbx

databricks-tools-core/databricks_tools_core/sql/sql_utils/executor.py

@@ -86,7 +86,13 @@ def execute(
         if row_limit is not None:
             exec_params["row_limit"] = row_limit
         if query_tags:
-            exec_params["query_tags"] = query_tags
+            from databricks.sdk.service.sql import QueryTag
+            exec_params["query_tags"] = [
+                QueryTag(key=k.strip(), value=v.strip())
+                for pair in query_tags.split(",")
+                for k, v in [pair.split(":", 1)]
+                if ":" in pair
+            ]
 
         # Submit the statement
         try: