Feature Request: timetravel support for query_table(..)

[cmettler]

Feature request: propagate AT (time travel) and DuckLake virtual columns (snapshot_id, rowid) through query_table()

What I'm trying to do

query_table(table_names, [by_name]) is the natural way to scan several DuckLake
tables dynamically in a single FROM clause (it expands to a UNION ALL, or
UNION ALL BY NAME when the second argument is true). I'd like to combine this
with DuckLake's time-travel and row-lineage features, e.g.:

SELECT snapshot_id, rowid,*
FROM query_table([x, y, z], 1) AT (TIMESTAMP => now());

i think it would be cool to have AT clause and virtual column support.