[JS/WebGPU] Squeeze operator implementation (#16024)
### Description
This PR adds an implementation of the `Squeeze` operator to WebGPU JSEP.
The implementation follows the [operator
schema](https://github.com/onnx/onnx/blob/main/docs/Operators.md#Squeeze)
and allows one or two inputs.
### How was it tested
1. I created two models. Without `axes`:
```Python
import onnx.helper
node = onnx.helper.make_node(
"Squeeze",
inputs=["T"],
outputs=["y"],
)
graph = onnx.helper.make_graph([node], "test", [onnx.helper.make_tensor_value_info("T", 1, [3, 1, 4, 5])],
[onnx.helper.make_tensor_value_info("y", 1, [3, 4, 5])])
onnx.save(onnx.helper.make_model(graph), "squeeze.onnx")
```
And with `axes`:
```Python
import onnx.helper
node = onnx.helper.make_node(
"Squeeze",
inputs=["T", "axes"],
outputs=["y"],
)
graph = onnx.helper.make_graph([node], "test", [onnx.helper.make_tensor_value_info("T", 1, [3, 1, 4, 5]), onnx.helper.make_tensor_value_info("axes", 7, [1])], [onnx.helper.make_tensor_value_info("y", 1, [3, 4, 5])])
onnx.save(onnx.helper.make_model(graph), "squeeze-dim.onnx")
```
2. I compiled the runtime using @fs-eire's
[instructions](https://gist.github.com/fs-eire/a55b2c7e10a6864b9602c279b8b75dce).
3. I ran the test models in the browser using this minimal setup:
```HTML
<html>
<script src=".\dist\ort.webgpu.min.js"></script>
<script>
async function run() {
const session = await ort.InferenceSession.create('squeeze-dim.onnx', {executionProviders: ['webgpu']});
console.log(session);
const input = new ort.Tensor('float32', new Float32Array(60), [3, 1, 4, 5]);
const dim = new ort.Tensor('int64', [-3n], [1]);
const output = await session.run({ "T": input, "axes": dim });
console.log(output);
}
run();
</script>
</html>
```
### Motivation and Context
Improve operator coverage for WebGPU JSEP.
