lag and lead window functions does not accept compatible default value

[simonvandel]

Describe the bug

The window functions lag and lead allow a default value as its third parameter.
Currently in DataFusion, this needs to be Int64 even though the value selected in the function is not of type Int64.

Postgres docs say that the default value only has to be compatible: https://www.postgresql.org/docs/current/functions-window.html

To Reproduce

DataFusion CLI v33.0.0
❯ create table t1 (a timestamp);
0 rows in set. Query took 0.009 seconds.

❯ insert into t1 values (1),(2),(3);
+-------+
| count |
+-------+
| 3     |
+-------+
1 row in set. Query took 0.013 seconds.

❯ select lag(a, 1, '1970-01-01T00:00:00.000000001'::timestamp) OVER(ORDER BY a) from t1;
Internal error: Expects default value to have Int64 type.
This was likely caused by a bug in DataFusion's code and we would welcome that you file an bug report in our issue tracker

Expected behavior

Allow any default value that can be coerced into the first parameter

Additional context

No response