[code-reflection] RFR: Integrated PartialEvaluator into Onnx [v3]

[Adam Sotona]

> Integrated PartialEvaluator into Onnx for loops unrolling + related LLM support.

Adam Sotona has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 15 additional commits since the last revision:

 - after merge fixes
   
 - Merge remote-tracking branch 'babylon/code-reflection' into onnx-unrolling
 - nit test fix
   
 - TensorDataStream helper class
   
 - fixed OnnxTransformer
   
 - unrolled LLMs - work in progress
   
 - unrolled LLMs - work in progress
   
 - PartialEvaluator integration into Onnx
   
 - support for constant arrays in returned tuples/records
   
 - constant arrays return - part 1
   
 - ... and 5 more: https://git.openjdk.org/babylon/compare/3ac08a66...31777435

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Changes:
  - all: https://git.openjdk.org/babylon/pull/462/files
  - new: https://git.openjdk.org/babylon/pull/462/files/aa84e3bd..31777435

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=462&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=462&range=01-02

  Stats: 17239 lines in 235 files changed: 8691 ins; 7994 del; 554 mod
  Patch: https://git.openjdk.org/babylon/pull/462.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/462/head:pull/462

PR: https://git.openjdk.org/babylon/pull/462