MethodMeta API to query of backends number and names

Author: shoumikhin

runtime/executor/method_meta.h

@@ -193,6 +193,21 @@ class MethodMeta final {
    */
   bool uses_backend(const char* backend_name) const;
 
+  /**
+   * Get the number of backends used in this method.
+   *
+   * @returns The total number of backend names.
+   */
+  size_t num_backends() const;
+
+  /**
+   * Get the backend name at the given index.
+   *
+   * @param[in] index The index of the backend name.
+   * @returns The backend name as a C-style string, or nullptr if the index is invalid.
+   */
+  const char* get_backend_name(size_t index) const;
+
   /**
    * Get the number of instructions in this method.
    *