Support querying Iceberg partition transforms

Create partitioned Iceberg tables:

 CREATE TABLE iceberg.test.buckets (
    "c0" integer,
    "c1" bigint
 )
 WITH (
    "format-version" = '2',
    location = 'file:/Users/yingsu/iceberg_data/iceberg_data/HIVE/test/buckets',
    partitioning = ARRAY['c1','bucket(c0, 2)'],
    "read.split.target-size" = 134217728,
    "write.delete.mode" = 'merge-on-read',
    "write.format.default" = 'PARQUET',
    "write.metadata.delete-after-commit.enabled" = false,
    "write.metadata.metrics.max-inferred-column-defaults" = 100,
    "write.metadata.previous-versions-max" = 100,
    "write.update.mode" = 'merge-on-read'
 )

We want to run queries like this

select iceberg.buckets.c0 from buckets where iceberg.BUCKET(c0, 1)=0;

 CREATE TABLE iceberg.test.months (
    "c0" integer,
    "ds" date
 )
 WITH (
    "format-version" = '2',
    location = 'file:/Users/yingsu/iceberg_data/iceberg_data/HIVE/test/months',
    partitioning = ARRAY['month(ds)'],
    "write.format.default" = 'PARQUET'
 );

We want to run queries like this:

select iceberg.MONTH(ds) from months;
select * from months where iceberg.MONTH(ds)=647;

Note that this is not Presto's MONTH(), DAY() functions. Those functions just return the month or the day of the year, while Iceberg's partition transform returns the number of months/days from 1970-01-01