Update on "[devtool] introduce datasink class to etdump"

this diff introduce datasink class, the class for managing the customized debug data storage pipeline.

Detials can be found in https://docs.google.com/document/d/1y_m32mKdj-OgLcLUz9TKhBW3PC3bBDYSBbeAH544EfM/edit?tab=t.0

Differential Revision: [D69583422](https://our.internmc.facebook.com/intern/diff/D69583422/)

[ghstack-poisoned]

Author: Gasoonjia

devtools/etdump/buffer_data_sink.cpp

@@ -10,6 +10,7 @@
 #include <executorch/devtools/etdump/utils.h>
 
 using ::executorch::runtime::Error;
+using ::executorch::runtime::Result;
 
 namespace executorch {
 namespace etdump {

devtools/etdump/buffer_data_sink.h

@@ -33,6 +33,9 @@ class BufferDataSink : public DataSinkBase {
   explicit BufferDataSink(::executorch::runtime::Span<uint8_t> buffer)
       : debug_buffer_(buffer), offset_(0) {}
 
+  BufferDataSink(const BufferDataSink&) = delete;
+  BufferDataSink& operator=(const BufferDataSink&) = delete;
+
   /**
    * Write data into the debug buffer and return the offset of the starting
    * location of the data within the buffer.
@@ -45,7 +48,8 @@ class BufferDataSink : public DataSinkBase {
    *         - An error code indicating the failure reason, if any issue
    *           occurs during the write process.
    */
-  Result<size_t> write(const void* ptr, size_t length) override;
+  ::executorch::runtime::Result<size_t> write(const void* ptr, size_t length)
+      override;
 
   /**
    * Write tensor into the debug buffer and return the offset of the starting
@@ -57,14 +61,15 @@ class BufferDataSink : public DataSinkBase {
    *         - An error code indicating the failure reason, if any issue
    *           occurs during the write process.
    */
-  Result<size_t> write_tensor(const executorch::aten::Tensor& tensor);
+  ::executorch::runtime::Result<size_t> write_tensor(
+      const executorch::aten::Tensor& tensor);
 
   /**
    * Retrieves the total size of the buffer.
    *
    * @return A Result object containing the total size of the buffer in bytes.
    */
-  Result<size_t> get_storage_size() const override;
+  ::executorch::runtime::Result<size_t> get_storage_size() const override;
 
   /**
    * Retrieves the number of bytes currently used in the buffer.

devtools/etdump/tests/buffer_data_sink_test.cpp

@@ -17,6 +17,7 @@ using namespace ::testing;
 using ::executorch::aten::ScalarType;
 using ::executorch::aten::Tensor;
 using ::executorch::runtime::Error;
+using ::executorch::runtime::Result;
 using ::executorch::runtime::Span;
 using torch::executor::testing::TensorFactory;