feat: add ms-istft-768-44k models (#5)

- feat: add ms-istft-768-44k models (fc0781ccff0d3ca1e5fdecabdf063f441a0d84f5)

ms-istft-768-44k/D_56000.pth

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ms-istft-768-44k/G_56000.pth

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ms-istft-768-44k/events.out.tfevents.1681574845.njwosv7az8.437.0

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ms-istft-768-44k/events.out.tfevents.1681574945.njwosv7az8.476.0

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ms-istft-768-44k/events.out.tfevents.1681575022.njwosv7az8.515.0

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