IntelPython / dpnp / 14062566601

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Add `dtype` keyword argument to `dpnp.fft.fftfreq` and `dpnp.fft.rfftfreq` (#2384)

The PR proposes to align `dpnp.fft.fftfreq` and `dpnp.fft.rfftfreq`
functions with
[2024.12](https://data-apis.org/array-api/2024.12/extensions/generated/array_api.fft.fftfreq.html)
revision of Python array API spec where `dtype` keyword was specified
for the functions.

Additionally, implementation of `dpnp.fft.fftfreq` was reworked a bit to
consume less memory and to avoid allocating temporary arrays.
Also docstrings of FFT functions were improved to add blank lines prior
defaults values.

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