[code-reflection] RFR: Explicit Arena passing to Tensor construction and Session execution [v2]

[Adam Sotona]

> Holding `Arena` instances in `OnnxRuntime` and `Session` still cause memory leaks.
> This patch allows to pass explicit arena for `Tensor` construction, `Session` construction and  each `Session` run.

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

  using Arena.ofConfined() instance for each individual test in CNNTest

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Changes:
  - all: https://git.openjdk.org/babylon/pull/337/files
  - new: https://git.openjdk.org/babylon/pull/337/files/58db6d00..3d33898d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=337&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=337&range=00-01

  Stats: 45 lines in 1 file changed: 6 ins; 0 del; 39 mod
  Patch: https://git.openjdk.org/babylon/pull/337.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/337/head:pull/337

PR: https://git.openjdk.org/babylon/pull/337