add origin tracking to own data and ndarray

Author: shivasankarka

numojo/core/own_data.mojo

@@ -11,7 +11,9 @@ from memory import UnsafePointer
 from numojo.core.traits.bufferable import Bufferable
 
 
-struct OwnData[dtype: DType]:  # TODO: implement `Bufferable` trait
+struct OwnData[
+    dtype: DType, *, mut: Bool, origin: Origin
+]:  # TODO: implement `Bufferable` trait
     var ptr: UnsafePointer[Scalar[dtype]]
 
     fn __init__(out self, size: Int):