[SPARK-22500][SQL] Fix 64KB JVM bytecode limit problem with cast

## What changes were proposed in this pull request?

This PR changes `cast` code generation to place generated code for expression for fields of a structure into separated methods if these size could be large.

## How was this patch tested?

Added new test cases into `CastSuite`

Author: Kazuaki Ishizaki <ishizaki@jp.ibm.com>

Closes #19730 from kiszk/SPARK-22500.