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Add test for real FFT of misaligned input arrays (#3087)

This PR adds `test_rfft_input_alignment` to the third-party FFT tests.
It covers real-to-complex FFTs whose input data pointer is not aligned
to the size of a complex output element.

The test runs `dpnp.fft.rfft` (1-D) and `dpnp.fft.rfftn` (3-D) on
float32/float64 inputs (float64 only on devices that support it), built
in three ways, each at element offset 0 (aligned) and 1 (misaligned):
- a contiguous view into a larger array (`a[offset]`)
- a strided view (`a[..., offset::2]`)
- an array created over an offset buffer (`dpnp.ndarray(shape,
dtype=dtype, buffer=backing, offset=offset)`)

Each case checks that the result matches NumPy and that the backing
buffer is left unchanged.

These cases already work on Intel CPU and GPU devices, so no change to
the implementation is needed; the test guards against regressions.

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