RFR: Fix empty arrays visualization

Tue Feb 6 08:55:14 UTC 2024

Currently, visualization of an empty array produces invalid DOT (see https://github.com/atp-mipt/ljv/issues/28)

The solution proposed is as discussed in that issue in 2021 (we now show array component type as well, also treating primitive types and "multidimensional" arrays correctly, that is `int[]`, `int[][]` etc).

This PR also changes the expected version of Java for LJV approval tests from 11 to 8 in order to simplify development of LJV as a part of JOL.

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Commit messages:
 - fix empty arrays Visualization. Show array component type

Changes: https://git.openjdk.org/jol/pull/57/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=57&range=00
  Stats: 196 lines in 25 files changed: 72 ins; 34 del; 90 mod
  Patch: https://git.openjdk.org/jol/pull/57.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/57/head:pull/57

PR: https://git.openjdk.org/jol/pull/57