Add support for data path in iOS (#13620)

^

Add constructor for the equivalent module constructor

Author: lucylq

extension/apple/ExecuTorch/Exported/ExecuTorchModule.h

@@ -124,16 +124,30 @@ __attribute__((deprecated("This API is experimental.")))
 @interface ExecuTorchModule : NSObject
 
 /**
- * Initializes a module with a file path and a specified load mode.
+ * Initializes a module with a file path, data path and a specified load mode.
  *
  * @param filePath A string representing the path to the ExecuTorch program file.
- * @param loadMode A value from ExecuTorchModuleLoadMode that determines the file loading behavior.
+ * @param dataFilePath A string representing the path to a .ptd file with
+ * external tensors and external data.
+ * @param loadMode A value from ExecuTorchModuleLoadMode that determines the
+ * file loading behavior.
  * @return An initialized ExecuTorchModule instance.
  */
 - (instancetype)initWithFilePath:(NSString *)filePath
+                    dataFilePath:(NSString *)dataPath
                         loadMode:(ExecuTorchModuleLoadMode)loadMode
     NS_DESIGNATED_INITIALIZER;
 
+/**
+ * Initializes a module with a file path and a specified load mode.
+ *
+ * @param filePath A string representing the path to the ExecuTorch program file.
+ * @param loadMode A value from ExecuTorchModuleLoadMode that determines the file loading behavior.
+ * @return An initialized ExecuTorchModule instance.
+ */
+- (instancetype)initWithFilePath:(NSString *)filePath
+                        loadMode:(ExecuTorchModuleLoadMode)loadMode;
+
 /**
  * Initializes a module with a file path using the default load mode (File mode).
  *

extension/apple/ExecuTorch/Exported/ExecuTorchModule.mm

@@ -250,11 +250,13 @@ @implementation ExecuTorchModule {
 }
 
 - (instancetype)initWithFilePath:(NSString *)filePath
+                    dataFilePath:(NSString *)dataFilePath
                         loadMode:(ExecuTorchModuleLoadMode)loadMode {
   self = [super init];
   if (self) {
     _module = std::make_unique<Module>(
       filePath.UTF8String,
+      dataFilePath.UTF8String,
       static_cast<Module::LoadMode>(loadMode)
     );
     _inputs = [NSMutableDictionary new];
@@ -263,8 +265,16 @@ - (instancetype)initWithFilePath:(NSString *)filePath
   return self;
 }
 
+- (instancetype)initWithFilePath:(NSString *)filePath
+                        loadMode:(ExecuTorchModuleLoadMode)loadMode {
+  return [self initWithFilePath:filePath
+                   dataFilePath:@""
+                       loadMode:loadMode];
+}
 - (instancetype)initWithFilePath:(NSString *)filePath {
-  return [self initWithFilePath:filePath loadMode:ExecuTorchModuleLoadModeFile];
+  return [self initWithFilePath:filePath
+                   dataFilePath:@""
+                       loadMode:ExecuTorchModuleLoadModeFile];
 }
 
 - (BOOL)loadWithVerification:(ExecuTorchVerification)verification