[lldb] Show coro_frame in `std::coroutine_handle` pretty printer (#141516)

This commit adjusts the pretty printer for `std::coroutine_handle` based
on recent personal experiences with debugging C++20 coroutines:

1. It adds the `coro_frame` member. This member exposes the complete
   coroutine frame contents, including the suspension point id and all
   internal variables which the compiler decided to persist into the
   coroutine frame. While this data is highly compiler-specific, inspecting
   it can help identify the internal state of suspended coroutines.
2. It includes the `promise` and `coro_frame` members, even if
   devirtualization failed and we could not infer the promise type / the
   coro_frame type. Having them available as `void*` pointers can still be
   useful to identify, e.g., which two coroutine handles have the same
   frame / promise pointers.

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