[lldb] Introduce SBFrameList for lazy frame iteration (#166651) This patch introduces `SBFrameList`, a new SBAPI class that allows iterating over stack frames lazily without calling `SBThread::GetFrameAtIndex` in a loop. The new `SBThread::GetFrames()` method returns an `SBFrameList` that supports Python iteration (`for frame in frame_list:`), indexing (`frame_list[0]`, `frame_list[-1]`), and length queries (`len()`). The implementation uses `StackFrameListSP` as the opaque pointer, sharing the thread's underlying frame list to ensure frames are materialized on-demand. This is particularly useful for ScriptedFrameProviders, where user scripts will be to iterate, filter, and replace frames lazily without materializing the entire stack upfront. Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>
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