TrinoSource.get_table_query_string() omits parentheses around query, causing SQL syntax errors in Trino compute engine #7017

Expected Behavior

When a TrinoSource is configured with query=..., calling get_table_query_string() should return the query wrapped in parentheses (f"({self.query})") so it can be referenced directly as a derived table in SQL FROM clauses.

This matches the behavior of all other SQL sources in Feast (BigQuerySource, SnowflakeSource, AthenaSource, RedshiftSource).

Current Behavior

TrinoSource.get_table_query_string() returns raw self.query:

def get_table_query_string(self) -> str:
    return self.table or self.query

Steps to reproduce

1. Define a TrinoSource using query=...:

source = TrinoSource(
    name="user_source",
    query="SELECT user_id, event_timestamp, val FROM catalog.schema.table",
    timestamp_field="event_timestamp",
)

2. Attach it to a feature view with online=True.
3. Configure batch_engine: {"type": "trino.engine"} and call store.materialize(...).
4. Trino fails during cursor.execute() with SYNTAX_ERROR: mismatched input 'SELECT'.