[crac] RFR: Assume module jars persistent

[Anton Kozlov]

Jar files opened by URLClassLoaders are assumed persistent. We need to handle module Jars the same way to prevent CheckpointException as reported by [1] 

[1] https://mail.openjdk.org/pipermail/crac-dev/2022-November/000380.html

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Commit messages:
 - Assume module jars persistent

Changes: https://git.openjdk.org/crac/pull/35/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=35&range=00
  Stats: 85 lines in 3 files changed: 76 ins; 7 del; 2 mod
  Patch: https://git.openjdk.org/crac/pull/35.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/35/head:pull/35

PR: https://git.openjdk.org/crac/pull/35