Add support for truncate statement in Iceberg

[ebyhr]

Description

Spark implementation:

• https://github.com/apache/spark/blob/201df0d7ac81f6bd5c39f513b0a06cb659dc9a3f/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/SupportsDeleteV2.java#L76-L82
• https://github.com/apache/iceberg/blob/c7de6cb345995cb47312edbef6edae2f17fb8aba/spark/v3.4/spark/src/main/java/org/apache/iceberg/spark/source/SparkTable.java#L366-L393

Release notes

(x) Release notes are required, with the following suggested text:

# Iceberg
* Add support for `TRUNCATE` statement. ({issue}`22340`)