Add benchmark for concurrent enqueues and removes

This test enqueues message on one thread before removing those messages
from another thread. Remove-threads wait for their paired
enqueue-threads to complete before beginning. These enqueue-remove
thread pairs run concurrently.

Test: atest MessageQueuePerfTest
Bug: 422736500
Flag: EXEMPT benchmark
Change-Id: I2ac1218ff7a8e28ae413b90716d7523626002881