[crac] RFR: Refactoring - extracted crac files

[Roman Marchenko]

CRaC-related functionality is moved to `crac*.hpp/cpp` files, and now it is in `crac` class instead of `os`.

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Commit messages:
 - Removing trailing spaces
 - Refactoring - extracted crac* files

Changes: https://git.openjdk.org/crac/pull/84/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=84&range=00
  Stats: 2177 lines in 10 files changed: 1135 ins; 1036 del; 6 mod
  Patch: https://git.openjdk.org/crac/pull/84.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/84/head:pull/84

PR: https://git.openjdk.org/crac/pull/84