[Feature][Transform-V2] allow package and class name in DynamicCompile java source

[yinrui97]

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Description

Looked at the doc in https://seatunnel.apache.org/zh-CN/docs/2.3.8/transform-v2/dynamic-compile, see below example
class name and package name are not allowed in source code, if I added them, there will be compile error. This is quite strange, you know, the source code is not validated java class.

If I need to modify the source code, I have to manually add package name and class name, after completion, I remove the package name and class name before running seatunnal job, this is quite incontinent.

In groovy DynamicCompile example, class name is allowed, I expect java DynamicCompile can also support this.

transform {
 DynamicCompile {
    source_table_name = "fake"
    result_table_name = "java_out"
    compile_language="JAVA"
    compile_pattern="SOURCE_CODE"
    source_code="""
                 import org.apache.seatunnel.api.table.catalog.Column;
                 import org.apache.seatunnel.transform.common.SeaTunnelRowAccessor;
                 import org.apache.seatunnel.api.table.catalog.*;
                 import org.apache.seatunnel.api.table.type.*;
                 import java.util.ArrayList;
                    public Column[] getInlineOutputColumns(CatalogTable inputCatalogTable) {
                       ...
                    }
                
                
                    public Object[] getInlineOutputFieldValues(SeaTunnelRowAccessor inputRow) {
                       ...
                    }
                """

  }
 } 

Usage Scenario

Use java DynamicCompile source code to customize transformation.

Related issues

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