[spark] Support nested col pruning

[Zouxxyy]

Purpose

to #4209, Support nested col pruning, e.g.

CREATE TABLE students (
    name STRING,
    age INT,
    course STRUCT<course_name: STRING, grade: DOUBLE>
) USING paimon;

SELECT course.grade FROM students;

will only obtain course.grade from colume-storage-format (parquet, orc)

Tests

API and Format

Documentation