change extract return types to decimal to align with postgres

[waitingkuo]

extract currently returns i32 which might loss some information

❯ select extract(second from timestamp '2000-01-01T00:00:00.1');
+--------------------------------------------------------+
| datepart(Utf8("SECOND"),Utf8("2000-01-01T00:00:00.1")) |
+--------------------------------------------------------+
| 0                                                      |
+--------------------------------------------------------+
1 row in set. Query took 0.000 seconds.

while postgresql returns decimal

willy=# select extract(second from timestamp '2000-01-01T00:00:00.1');
 extract  
----------
 0.100000
(1 row)

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change it to decimal

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[tustvold]

This likely will want to wait until decimal support is more consistent - see #4036

[comphead]

@waitingkuo looks like #4385 will address this ticket? Tests return seconds as floats

[waitingkuo]

@comphead this is to align with postgresql to output decimal instead of decimal which could prevent something like this

❯ select date_part('millisecond', timestamp '2000-01-01T00:00:09.123456');
+------------------------------------------------------------------+
| datepart(Utf8("millisecond"),Utf8("2000-01-01T00:00:09.123456")) |
+------------------------------------------------------------------+
| 9123.455999999998                                                |
+------------------------------------------------------------------+
1 row in set. Query took 0.002 seconds.

note that this datafusion-cli is from the date_part_f64 branch