Replace GSL with GSL-LITE submodule and fix up refs (#1920)

Remove gsl subodule and replace with a local copy of gsl-lite
  Refactor for onnxruntime::make_unique
  gsl::span size and index are now size_t
  Remove lambda auto argument type detection.
  Remove constexpr from fail_fast in gsl due to Linux not being happy.
  Comment out std::stream support due to MacOS std lib broken.
  Move make_unique into include/core/common so it is accessible for server builds.
  Relax requirements for onnxruntime/test/providers/cpu/ml/write_scores_test.cc
  due to x86 build.
  Add ONNXRUNTIME_ROOT to Server Lib includes so gsl is recognized