[code-reflection] Integrated: Update JSON API

[Paul Sandoz]

Update JSON API

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

Commit messages:
 - Update JSON API.

Changes: https://git.openjdk.org/babylon/pull/427/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=427&range=00
  Stats: 3299 lines in 29 files changed: 1613 ins; 1570 del; 116 mod
  Patch: https://git.openjdk.org/babylon/pull/427.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/427/head:pull/427

PR: https://git.openjdk.org/babylon/pull/427