[crac] RFR: Win/Mac build for CRaC [v13]

[Roman Marchenko]

> - OS-dependent CRaC functionality moved to `crac_<os>`.* files.
> - Data structures moved to `crac_structs.hpp`
> - Added necessary cross-platform functionality
> - Some local calls are put under `#ifdef` checks
> - GHA: Enabled Crac tests run in windows build
> - GHA: macOs build is disabled until CRaC moves to newer JDK version.

Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:

  Fixing review comments

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Changes:
  - all: https://git.openjdk.org/crac/pull/82/files
  - new: https://git.openjdk.org/crac/pull/82/files/3f57b322..d22273e0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=82&range=12
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=82&range=11-12

  Stats: 18 lines in 2 files changed: 10 ins; 7 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/82.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/82/head:pull/82

PR: https://git.openjdk.org/crac/pull/82