Port Riva's mel cepstral distortion w/ dynamic time warping notebook (#5778)

* Port and update Riva MCD DTW tutorial to NeMo TTS tutorials

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

* Add audio files for the MCD DTW notebook

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

* Moved MCD DTW examples to tarball, added add'l resources section

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

* Fix wget link for MCD DTW notebook

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

* Rework audio playing

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

* Typo fixes to MCD DTW notebook

Co-authored-by: Jason <jasoli@nvidia.com>
Signed-off-by: Jocelyn <jocelynh@nvidia.com>

* Pass sample rate to librosa load

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>
Signed-off-by: Jocelyn <jocelynh@nvidia.com>
Co-authored-by: Jason <jasoli@nvidia.com>

Author: redoctopus