Refactor the sample plugin.

[JackChen365]

Main changes

• Add a PreTransformClassesWithAsmTask to read cache from PostTransformClassesWithAsmTask
• Generate configuration cache and write it to an intermediate file.

Use TransformClassesWithAsm outputs to determine which class is deleted.

    val transformOutputDirs = transformOutputsProvider.get()
    val classFileList =
      transformOutputDirs.flatMap { it.walk().filter { classFile -> classFile.name.endsWith(".class") } }
    val sampleList = SampleClassHandler.getSampleList().toMutableList()
    sampleList.removeIf { item ->
      val classPath = item.className.replace('.', '/')
      classFileList.none { it.absolutePath.endsWith("$classPath.class") }
    }
    val extensionList = SampleClassHandler.getExtensionList().toMutableList()
    extensionList.removeIf { item ->
      val classPath = item.className.replace('.', '/')
      classFileList.none { it.absolutePath.endsWith("$classPath.class") }
    }

• Move all the configuration-related code into PostTransformClassesWithAsmTask

How to test it

Run `test plugin with incremental` method at least twice to check the output result.