Rewrite delete logic to fix transformed partition types

[xieandrew]

Fixes #78 by reading the manifest for transformed partition names instead of column names. It also applies the partition transform to the input if it is a timestamp in order to convert to the Iceberg int representation for time units (e.g. months since epoch).

Examples:

Partitioned by day:
ice delete nyc.taxis_p_by_day --partition '[{"name": "tpep_pickup_datetime_day", "values": ["2024-12-31"]}]'

Partitioned by month:
ice delete nyc.taxis_p_by_month --partition '[{"name": "tpep_pickup_datetime_month", "values": ["2025-02-01"]}]'

Partitioned by hour:
ice delete nyc.taxis_p_by_hour --partition '[{"name": "tpep_pickup_datetime_hour", "values": ["2025-01-01T03:00:00"]}]'