message: Bump Orca version to 2.0
diff: cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
  project(gpopt LANGUAGES CXX C)
  -set(GPORCA_VERSION_MAJOR 1)
  -set(GPORCA_VERSION_MINOR 697)
  +set(GPORCA_VERSION_MAJOR 2)
  +set(GPORCA_VERSION_MINOR 0)
  set(GPORCA_VERSION_STRING ${GPORCA_VERSION_MAJOR}.${GPORCA_VERSION_MINOR})
  # Whenever an ABI-breaking change is made to GPORCA, this should be incremented.
  