[LTC] Code-gen nll_loss2d_forward (#70018)
* [LTC] Code-gen nll_loss2d_forward
Summary:
Code-gen nll_loss2d_forward
Test:
```
lazy_tensor_core/test/cpp/build/test_ptltc
```
Also:
```python
import torch
import lazy_tensor_core
import lazy_tensor_core.debug.metrics
lazy_tensor_core._LAZYC._ltc_init_ts_backend()
device = 'lazy'
inp = torch.rand((3, 3, 100, 100), device=device)
target = torch.zeros((3, 100, 100), dtype=torch.long, device=device)
print(torch.nn.functional.nll_loss(inp, target))
print(lazy_tensor_core.debug.metrics.metrics_report())
```
Outputs:
```
...
Counter: lazy::nll_loss2d_forward
Value: 1
...
```
Fixes #65576
