Back out "Add et_dump related API to module"

Summary:
Original commit changeset: af24e31be49d

Original Phabricator Diff: D71135352

Rollback Plan:

Differential Revision: D76742727

Author: cccclai

extension/module/module.h

@@ -478,11 +478,6 @@ class Module {
     return event_tracer_.get();
   }
 
-  ET_NODISCARD
-  runtime::Span<uint8_t> debug_buffer() {
-    return runtime::Span<uint8_t>(debug_buffer_.data(), debug_buffer_.size());
-  }
-
  private:
   struct MethodHolder {
     std::vector<std::vector<uint8_t>> planned_buffers;
@@ -503,7 +498,6 @@ class Module {
   std::unique_ptr<runtime::EventTracer> event_tracer_;
   std::unique_ptr<runtime::DataLoader> data_map_loader_;
   std::unique_ptr<NamedDataMap> data_map_;
-  std::vector<uint8_t> debug_buffer_;
 
  protected:
   std::unordered_map<std::string, MethodHolder> methods_;