[roll] Roll fuchsia [32bit][profiler] Implement Skeleton for Stack Sampling This change introduces the `StackSampler` class, intended to handle DWARF-based stack sampling. It updates `ProfilerControllerImpl` to inspect the sampling configuration's callgraph strategy. If `CallgraphStrategy::kDwarf` is selected, the controller now instantiates a `StackSampler`. The current implementation of `StackSampler::Start` returns `ZX_ERR_NOT_SUPPORTED` as a placeholder. The existing logic for frame pointer sampling is preserved and moved under the `CallgraphStrategy::kFramePointer` case. Original-Bug: 465218516 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1438414 Original-Revision: fcfe42aca94b5a08d7fcd42d353b388c332e48f1 GitOrigin-RevId: 8deaa34d59fae65fe08cfbeec17048db542e20fd Change-Id: I7ae744885f5f80e5bafb28425b50508706b76a75
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