[ET-VK] Adding get or create int function to read int value. (#12507)

This diff adds a new function `get_or_create_int` to the `ComputeGraph` class, which allows reading an integer value from a `ValueRef` index. The function returns the extracted integer value if the value at the index is an integer, otherwise it throws an error. Additionally, an overload of the function is added to return a default value if the value at the index is `None`.

Differential Revision: [D78094858](https://our.internmc.facebook.com/intern/diff/D78094858/)

Author: pytorchbot

backends/vulkan/runtime/graph/ComputeGraph.h

@@ -424,6 +424,12 @@ class ComputeGraph final {
   // Scalar Value Extraction
   //
 
+  bool is_scalar_or_none(const ValueRef idx) const {
+    const Value& value = values_.at(idx);
+    return value.isInt() || value.isDouble() || value.isBool() ||
+        value.isNone();
+  }
+
   template <typename T>
   T extract_scalar(const ValueRef idx) {
     Value& value = values_.at(idx);
@@ -439,6 +445,15 @@ class ComputeGraph final {
     VK_THROW("Cannot extract scalar from Value with type ", value.type());
   }
 
+  template <typename T>
+  T extract_scalar_or(const ValueRef idx, const T default_value) {
+    Value& value = values_.at(idx);
+    if (value.isNone()) {
+      return default_value;
+    }
+    return extract_scalar<T>(idx);
+  }
+
   template <typename T>
   std::optional<T> extract_optional_scalar(const ValueRef idx) {
     if (val_is_none(idx)) {