libbinder_rs: Add Strong<> and Weak<> Binder references

Adds Strong<dyn Interface> and Weak<dyn Interface> references for Binder
interfaces. These structs are equivalent to sp<Interface> and
wp<Interface> in C++.

Bug: 175584883
Test: atest -p frameworks/native/libs/binder/TEST_MAPPING
Change-Id: Icf1b3acf0d8c82d541281a5aae9814372a5ab800
6 files changed