Fix dask.array.fft mismatch with Numpy's interface (add support for norm argument)

[joanrue]

• Closes Support norm in dask.array.fft #3280 where norm argument was needed to match numpy.fft API.
• Adds tests to validate that the different values for norm match NumPy's.
• Passes pre-commit run --all-files

[GPUtester]

Can one of the admins verify this patch?

Admins can comment ok to test to allow this one PR to run or add to allowlist to allow all future PRs from the same author to run.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

     15 files  ±0       15 suites  ±0   3h 49m 58s ⏱️ + 3m 5s
 12 941 tests ±0   11 620 ✅ + 23     917 💤  -  12  404 ❌  - 10 
160 329 runs  ±0  143 168 ✅ +138  16 757 💤  - 127  404 ❌  - 10 

For more details on these failures, see this check.

Results for commit a985de3. ± Comparison against base commit cdcddb6.

This pull request removes 28 and adds 28 tests. Note that renamed tests count towards both.

dask.array.tests.test_fft ‑ test_wrap_fftns[float32-fft2-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-fftn-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-ifft2-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-ifftn-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-irfft2-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-irfftn-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-rfft2-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-rfftn-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float64-fft2-scipy.fftpack]
dask.array.tests.test_fft ‑ test_wrap_fftns[float64-fftn-scipy.fftpack]
…

dask.array.tests.test_fft ‑ test_wrap_fftns[float32-fft2-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-fftn-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-ifft2-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-ifftn-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-irfft2-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-irfftn-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-rfft2-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float32-rfftn-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float64-fft2-scipy.fft]
dask.array.tests.test_fft ‑ test_wrap_fftns[float64-fftn-scipy.fft]
…

[joanrue]

Hi! I'm reaching out to see if there's anything more I can do to facilitate the review process.