[code-reflection] RFR: Test remove final vars

[Mourad Abbay]

A transformation to remove final vars, it serves as an example on how to use the API to write transformations.

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Commit messages:
 - Test remove final vars

Changes: https://git.openjdk.org/babylon/pull/25/files
 Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=25&range=00
  Stats: 86 lines in 1 file changed: 86 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/25.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/25/head:pull/25

PR: https://git.openjdk.org/babylon/pull/25