Replace StringPiece with std::string_view in profman.

And in dexoptanalyzer and hiddenapi, see below.

The parsing helpers in utils.h were mostly unused, only
profman was calling one of them, so move that helper to
profman and rewrite and fix it, remove the other helpers.
This exposed dependency of dexoptanalyzer and hiddenapi
on StringPiece indirectly included from utils.h, thus we
replace it with std::string_view also in those tools.

During the rewrite, avoid using std::string_view::data()
as a null terminated string, prefer to fall back to the
original null terminated raw option instead.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 123750182
Change-Id: Ibeec8069a5d82ea556e03e4577812f94dca6f387