Clients of PackagingBase can customize dependency tag to use

Previously, the dep tag used by PackagingBase was fixed, which prevented
some of its clients (e.g. cvd-host-package) from opting in to
android.InstallAlwaysNeededDependencyTag. Now, PackagingBase.AddDeps
accepts the dependency tag to use.

Also, dependencies toward rust dylib, rlib, and proc_macro are
configured to return true on InstallDepNeeded. This is required to
install shared_lib dependencies of the rust modules when they are
depended on by a rust binary.

Exempt-From-Owner-Approval: a trivial change after +2 from the owner.
This has to land ASAP as many users are affected by acloud being
unavailable.

Bug: N/A
Test: m
Test: acloud create --local-instance --local-image
Change-Id: If22aee7c6f314fcb03b9d4fe6901a2557f1e899c