Introduce a count for registered shared library on ResourcesImpl to

help to fix gmail crash.

Gmail crashes consistently while copy pasting texts into the body of
composing an email. This happened because previous design missed to
handle an edge case when after a shared library have its asset paths
registered, new created Resources could find an outdated ResourcesImpl
cache which does not have the proper lib asset paths appended and
reuse it. Introduced a count for shared library on ResourcesImpl to
fix it.

Bug: b/329915827
Test: Verified all affected tests pass and manually tested on device.
Change-Id: I3183e5c8c20ac8f86501846e6f6dd82e035402fc