Add a specialized LocalUnwinder object.

This object is for doing many local unwinds across different threads
at any point during a program's execution.

Also add LocalUpdatableMaps that will re-read the maps data under certain
circumstances.

This first version does not support jit or dex pc data.

Bug: 74361929

Test: Ran unit tests.
Change-Id: I790662366d3fed677f31b3288182950c494de9ad