Merge changes from topics "people-space-benchmark",...

Merge changes from topics "people-space-benchmark", "people-space-jank-benchmark", "sysui-compose-initializer" into tm-qpr-dev

* changes:
  Show the Compose implementation of the footer actions when available
  Introduce ComposeInitializer (1/2)
  Add a Microbenchmark for the conversations list (2/2)
  Add a Microbenchmark for the PeopleSpace activity (2/2)