Fix complex printing for sci_mode=True (#40513) (#40919)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40513
This PR makes the following changes:
1. Complex Printing now uses print formatting for it's real and imaginary values and they are joined at the end.
2. Adding 1. naturally fixes the printing of complex tensors in sci_mode=True
```
>>> torch.tensor(float('inf')+float('inf')*1j)
tensor(nan+infj)
>>> torch.randn(2000, dtype=torch.cfloat)
tensor([ 0.3015-0.2502j, -1.1102+1.2218j, -0.6324+0.0640j, ...,
-1.0200-0.2302j, 0.6511-0.1889j, -0.1069+0.1702j])
>>> torch.tensor([1e-3, 3+4j, 1e-5j, 1e-2+3j, 5+1e-6j])
tensor([1.0000e-03+0.0000e+00j, 3.0000e+00+4.0000e+00j, 0.0000e+00+1.0000e-05j,
1.0000e-02+3.0000e+00j, 5.0000e+00+1.0000e-06j])
>>> torch.randn(3, dtype=torch.cfloat)
tensor([ 1.0992-0.4459j, 1.1073+0.1202j, -0.2177-0.6342j])
>>> x = torch.tensor([1e2, 1e-2])
>>> torch.set_printoptions(sci_mode=False)
>>> x
tensor([ 100.0000, 0.0100])
>>> x = torch.tensor([1e2, 1e-2j])
>>> x
tensor([100.+0.0000j, 0.+0.0100j])
```
Test Plan: Imported from OSS
Differential Revision: D22309294
Pulled By: anjali411
fbshipit-source-id: 20edf9e28063725aeff39f3a246a2d7f348ff1e8
Co-authored-by: anjali411 <chourdiaanjali123@gmail.com>
