[Compiler Refactor 4] Introduce new APIs in OperatorDescriptor to support new OpExecConfig interface

[zuozhiw]

This PR is a follow-up of #1791 , where a new OpExecConfig interface is introduced for the new workflow compiler layer. This PR changes the OperatorDescriptor interface to use the new OpExecConfig. Currently, the old and new interfaces exist in parallel. After all migrations are completed, the old interface will be removed.

New interfaces:

  def newOperatorExecutor(operatorSchemaInfo: OperatorSchemaInfo): NewOpExecConfig = {
    throw new UnsupportedOperationException(
      "operator " + operatorIdentifier + " is not migrated to new OpExec API"
    )
  }

  // a logical operator corresponds multiple physical operators (a small DAG)
  def operatorExecutorMultiLayer(operatorSchemaInfo: OperatorSchemaInfo): PhysicalPlan = {
    new PhysicalPlan(List(newOperatorExecutor(operatorSchemaInfo)), List())

Logical operators that correpond to a single physical operator will implement newOperatorExecutor interface.
Logical operators that correpond to a multiple physical operator (such as aggregate) will implement operatorExecutorMultiLayer interface.

[Yicong-Huang]

@zuozhiw can we add an annotation to indicate the deprecation of the old API? Users may be confused about which API to use now.