chore: import upstream snapshot with attribution

docs/source/tools/speech_data_processor.rst

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+Speech Data Processor
+=====================
+
+Speech Data Processor (SDP) is a toolkit to make it easy to:
+  1. write code to process a new dataset, minimizing the amount of boilerplate code required.
+  2. share the steps for processing a speech dataset.
+
+SDP is hosted here: https://github.com/NVIDIA/NeMo-speech-data-processor.
+
+To learn more about SDP, please check the [documentation](https://nvidia.github.io/NeMo-speech-data-processor/).