Update base for Update on "[3/N] Add get_option/set_option function in backend interface"

Add update function in backend interface class. The update function will receive the backend options from dispatched by the ET runtime.

ET runtime's logic: loop over each backend and it's corresponding backend options, dispatch the backend options to the corresponding backend

Next step, will add update API in the method and then module
exported-using-ghexport

Differential Revision: [D75919242](https://our.internmc.facebook.com/intern/diff/D75919242/)

Differential Revision: [D75919242](https://our.internmc.facebook.com/intern/diff/D75919242)

[ghstack-poisoned]

Author: cccclai

runtime/backend/backend_update_context.h renamed to runtime/backend/backend_option_context.h

@@ -14,12 +14,12 @@
 namespace executorch {
 namespace ET_RUNTIME_NAMESPACE {
 /**
- * BackendUpdateContext will be used to inject runtime info for to initialize
+ * BackendOptionContext will be used to inject runtime info for to initialize
  * delegate.
  */
-class BackendUpdateContext final {
+class BackendOptionContext final {
  public:
-  explicit BackendUpdateContext(){}
+  explicit BackendOptionContext(){}
 };
 
 } // namespace ET_RUNTIME_NAMESPACE
@@ -29,6 +29,6 @@ namespace torch {
 namespace executor {
 // TODO(T197294990): Remove these deprecated aliases once all users have moved
 // to the new `::executorch` namespaces.
-using ::executorch::ET_RUNTIME_NAMESPACE::BackendUpdateContext;
+using ::executorch::ET_RUNTIME_NAMESPACE::BackendOptionContext;
 } // namespace executor
 } // namespace torch

runtime/backend/targets.bzl

@@ -17,7 +17,7 @@ def define_common_targets():
             exported_headers = [
                 "backend_execution_context.h",
                 "backend_init_context.h",
-                "backend_update_context.h",
+                "backend_option_context.h",
                 "options.h",
                 "interface.h",
             ],