[code-reflection] RFR: ONNX FFM Runtime initial work [v4]

[Adam Sotona]

> This is initial work on ONNX FFM runtime with very raw connection with OnnxInterpreter and Tensor.
> 
> It is a rebase of https://github.com/PaulSandoz/babylon/pull/1

Adam Sotona has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 12 commits:

 - Merge remote-tracking branch 'babylon/code-reflection' into onnx-runtime-initial
   
 - Merged OnnxRuntime with OnnxRuntime.Environment and made singleton with shutdown hook
   
 - minor rename
   
 - OnnxRuntime use OnnxSchema - work in progress
   
 - minor OnnxProtoBuilder change
   
 - minor OnnxProtoBuilder change
   
 - unused imports
   
 - Implementation of dedicated OnnxProtoBuilder
   
 - OnnxRuntime work in progress
   
 - OnnxRuntime work in progress
   
 - ... and 2 more: https://git.openjdk.org/babylon/compare/8cde02f9...ed4b8178

-------------

Changes: https://git.openjdk.org/babylon/pull/311/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=311&range=03
  Stats: 942 lines in 7 files changed: 936 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/311.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/311/head:pull/311

PR: https://git.openjdk.org/babylon/pull/311