[code-reflection] RFR: OnnxLift prototype [v3]

[Adam Sotona]

> This is a prototype of OnnxLift tool.
> It lifts ONNX model binary to ONNX code reflection model, extracts weights, and generates Java model source.

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  refactoring split to JavaTemplate

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Changes:
  - all: https://git.openjdk.org/babylon/pull/638/files
  - new: https://git.openjdk.org/babylon/pull/638/files/003e0d5d..4aa3ce64

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=638&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=638&range=01-02

  Stats: 718 lines in 2 files changed: 381 ins; 323 del; 14 mod
  Patch: https://git.openjdk.org/babylon/pull/638.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/638/head:pull/638

PR: https://git.openjdk.org/babylon/pull/638