Support extracting week and week's year from date or timestamp

Add support for `extract(week_iso from date_time)` and `date_part('week_iso', date_time)`.
Add support for `extract(year_of_week_iso from date_time)` and `date_part('year_of_week_iso', date_time)`.

## References

### PostgreSQL

https://www.postgresql.org/docs/17/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT

- week (ISO week)
- isoyear (year of week)

### Trino

https://github.com/trinodb/trino/blob/8e88778a03f137a0c0924875f8d4560138d23d10/core/trino-parser/src/main/java/io/trino/sql/tree/Extract.java#L36

https://github.com/trinodb/trino/blob/8e88778a03f137a0c0924875f8d4560138d23d10/core/trino-parser/src/main/java/io/trino/sql/tree/Extract.java#L43

### Snowflake

https://docs.snowflake.com/en/sql-reference/functions-date-time#supported-date-and-time-parts

- week
- weekiso | week_iso
- yearofweek
- yearofweekiso

## Notes

Snowflake has two variants of these functions / date-time fields. The ISO variant is means always the same thing. The non-ISO is session-dependent.
In our implementation we should support the ISO semantics. We could use ISO terminology (`_iso` names), or support them as aliases.