Remove `F.complex_norm` and `T.ComplexNorm`

[mthrok]

As planned in #1337, F.complex_norm and T.ComplexNorm are now deprecated, and we can remove them.

Steps

1. Remove the implementation

audio/torchaudio/functional/functional.py

Line 719 in 25a8adf

def complex_norm(

audio/torchaudio/transforms.py

Line 884 in bf580c7

class ComplexNorm(torch.nn.Module):

2. Remove test

audio/test/torchaudio_unittest/functional/functional_impl.py

Lines 322 to 330 in 25a8adf

	@parameterized.expand(
	list(itertools.product([(1, 2, 1025, 400, 2), (1025, 400, 2)], [1, 2, 0.7]))
	)
	def test_complex_norm(self, shape, power):
	torch.random.manual_seed(42)
	complex_tensor = torch.randn(*shape, dtype=self.dtype, device=self.device)
	expected_norm_tensor = complex_tensor.pow(2).sum(-1).pow(power / 2)
	norm_tensor = F.complex_norm(complex_tensor, power)
	self.assertEqual(norm_tensor, expected_norm_tensor, atol=1e-5, rtol=1e-5)

audio/test/torchaudio_unittest/transforms/torchscript_consistency_impl.py

Line 89 in 25a8adf

def test_ComplexNorm(self):

3. Make sure the test passes.

4. Update docs

https://github.com/pytorch/audio/blob/25a8adf6d642bc27b156a452bc80f20741382642/docs/source/functional.rst

https://github.com/pytorch/audio/blob/25a8adf6d642bc27b156a452bc80f20741382642/docs/source/transforms.rst

Note

For setting up the development environment, please refer to CONTRIBUTING.md and torchaudio_unittest

[harishsdev]

@mthrok ,@nateanl ,please close this issue