[GR-66562] Add a logging mechanism that can be used from uninterruptible code.

[graalvmbot]

This PR contains the following changes:

• Added a logging mechanism (see Debug.stderr(), DebugStdErrLog, and StdErrWriter) that can be used from uninterruptible code and that is mostly compatible with Log.log().
• Log no longer implements AutoCloseable. This gets rid of a lot of IDE warnings.
• Refactorings
  • Log is now an interface
  • AbstractLog now contains most of the logging implementation that was in RealLog before.
  • Moved NoopLog and LogOutputStream to separate files (were in Log.java before).
  • Moved static fields from Log to new class Loggers.
• Small fixes
  • Fixed a few inconsistencies around the logging of null values.
  • Fixed an issue where JDKUtils.getBacktrace(...) would throw a fatal error in case of a race condition.
  • Use HANDLE instead of int for FileAPI functions on Windows.
• Various smaller cleanups.