Add LeakyBondedQueue to libosi

* LeakyBondedQueue is a fixed size queue that leaks oldest item when
  reaching its capacity. This is useful in creating memory bonded data
  structure where freshness is more important than full coverage.
* The queue is protected by a simple mutex and is thread-safe, although
  improvements could be made to lock enqueue and dequeue separately, it
  is not implemented at this moment due to lack of demand
* The queue uses unique_ptr to automatically free its content when it is
  destructed
* Add several tests to verify its API and memory management
* This data structure will be firstly used in the metrics module

Bug: 33781460
Test: Code compilation, unit tests
Merged-In: I51cb73666ac58e4792d9cba0d6f16dad30a0ff39
Change-Id: I51cb73666ac58e4792d9cba0d6f16dad30a0ff39
(cherry picked from commit 4ad0b2ba)