chore: import upstream snapshot with attribution

docs/source/tts/api.rst

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+.. _nemo tts collection api:
+
+NeMo TTS API
+============
+
+Model Classes
+-------------
+
+MagpieTTS (Codec-based TTS)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+MagpieTTS is an end-to-end TTS model that generates audio codes from transcript and optional context (audio or text). It supports multiple architectures (e.g. multi-encoder context, decoder context) and can be used for standard, long-form, and streaming inference.
+
+.. autoclass:: nemo.collections.tts.models.MagpieTTSModel
+    :show-inheritance:
+    :members: infer_batch, do_tts, generate_long_form_speech, list_available_models, audio_to_codes, codes_to_audio, has_baked_context_embedding, num_baked_speakers, get_baked_context_embeddings_batch, create_longform_chunk_state, embed_text, prepare_context_tensors
+
+Mel-Spectrogram Generators
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. autoclass:: nemo.collections.tts.models.FastPitchModel
+    :show-inheritance:
+    :members:
+    :exclude-members: setup_training_data, setup_validation_data, training_step, on_validation_epoch_end, validation_step, setup_test_data, on_train_epoch_start
+
+
+Vocoders
+~~~~~~~~
+.. autoclass:: nemo.collections.tts.models.HifiGanModel
+    :show-inheritance:
+    :members:
+    :exclude-members: setup_training_data, setup_validation_data, training_step, on_validation_epoch_end, validation_step, setup_test_data, on_train_epoch_start
+
+
+Codecs
+~~~~~~
+.. autoclass:: nemo.collections.tts.models.AudioCodecModel
+    :show-inheritance:
+    :members:
+    :exclude-members: setup_training_data, setup_validation_data, training_step, on_validation_epoch_end, validation_step, setup_test_data, on_train_epoch_start
+
+
+Base Classes
+----------------
+
+The classes below are the base of the TTS pipeline.
+
+.. autoclass:: nemo.collections.tts.models.base.MelToSpec
+    :show-inheritance:
+    :members:
+
+.. autoclass:: nemo.collections.tts.models.base.SpectrogramGenerator
+    :show-inheritance:
+    :members:
+
+.. autoclass:: nemo.collections.tts.models.base.Vocoder
+    :show-inheritance:
+    :members:
+
+
+Dataset Processing Classes
+--------------------------
+.. autoclass:: nemo.collections.tts.data.dataset.TTSDataset
+    :show-inheritance:
+    :members:
+
+.. autoclass:: nemo.collections.tts.data.dataset.VocoderDataset
+    :show-inheritance:
+    :members: