More android.util in Ravenwood, supported by CTS.

Carry over some existing tests from frameworks/base/ and get them
compiling against `current-test` so that CTS can verify these
public APIs, paving the way for them to be included in Ravenwood.

Bug: 292141694
Test: atest-dev CtsUtilTestCasesRavenwood
Change-Id: I8d49b34d916f7d2abcde9f3236f0bfc741218d37