Add basic linear layer tests

build.toml

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+[general]
+name = "kernels_test"
+
+[torch]
+universal = true

torch-ext/kernels_test/__init__.py

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+from . import layers
+
+__all__ = ["layers"]

torch-ext/kernels_test/layers.py

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+import torch
+import torch.nn as nn
+
+
+class LinearImplicitBackward(nn.Module):
+    def forward(self, input: torch.Tensor) -> torch.Tensor:
+        return F.linear(input, self.weight, self.bias)
+
+
+class LinearBackward(nn.Module):
+    has_backward = True
+
+    def forward(self, input: torch.Tensor) -> torch.Tensor:
+        return F.linear(input, self.weight, self.bias)
+
+
+class LinearNoBackward(nn.Module):
+    has_backward = False
+
+    def forward(self, input: torch.Tensor) -> torch.Tensor:
+        return F.linear(input, self.weight, self.bias)
+
+
+__all__ = ["LinearImplicitBackward", "LinearBackward", "LinearNoBackward"]