Introduce RavenwoodEnvironment

This class is responsible for various app/process lifecycle related
initialization, which is currently scattered across different classes,
such as RavenwoodContext / Environment / etc.

Currently, we have an init() method in *_ravenwoood classes to allow
RavenwoodDriver to push various information to them. We'll start using
this class to "pull" information from *_ravenwoood classes directly.

For example, an upcoming ContextImpl_ravenwood class will get various
states from this class directly.

Bug: 292141694
Flag: TEST_ONLY
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -s
Change-Id: I4637ad4958e5a09d0f6c5477ca38152f263056e8