Ravenwood support for `wtf()`, wrap logging.

There are some tests triggering `wtf()` during the normal course of
operation, and we haven't been able to reproduce them yet.  This
change gives us a valid `wtf()` implementation to aid debugging.

It's also a bit jarring to have log-style messages interleaved with
raw `System.out`, so also add `redirectLogStreams()` to match the
logging behavior that developers observe on physical devices.

Bug: 322805216
Test: atest FrameworksCoreTestsRavenwood FrameworksUtilTestsRavenwood
Change-Id: I8ea2d12638cd998e3962aaa8af09a3335fcd0d51