[Impeller] remove Buffer type and associated abstractions. #49702
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Now that the HostBuffer isn't implementing Buffer, there is really no reason to have a Buffer/DeviceBuffer split. make BufferViews use a DeviceBuffer, and remove the data ptr from buffer views (as we can always reach into the device buffer).
Makes some other cleanups too, since we always use a std::shared_ptr, then we can eliminated the shared_from_this call for AsBufferView by making this a static method.