Refactor mkl fft planning to not use Tensor objects

[peterbell10]

Stack from ghstack:

• Use new FFT operators in stft #47601 Use new FFT operators in stft
• Optimize torch.fft.fftn for real input with an r2c transform #46912 Optimize torch.fft.fftn for real input with an r2c transform
• Improve torch.fft n-dimensional transforms #46911 Improve torch.fft n-dimensional transforms
• Refactor mkl fft planning to not use Tensor objects #46910 Refactor mkl fft planning to not use Tensor objects

Differential Revision: D25119656

[dr-ci]

💊 CI failures summary and remediations

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@mruberry merged this pull request in 18ae12a.