[ExecuTorch] Separate extension.Module Namespaces from Aten and non-Aten

Separate `extension.Module` Namespaces to be `executorch::extension::module` and `executorch::extension::module_aten`, otherwise in the future there will be issues like P1799454769.

It's similar to what we already did for bundled_program in #10307

Differential Revision: [D73903870](https://our.internmc.facebook.com/intern/diff/D73903870/)

[ghstack-poisoned]

Author: zhenyan-zhang-meta

docs/source/extension-module.md

@@ -13,6 +13,7 @@ Let's see how we can run the `SimpleConv` model generated from the [Exporting to
 #include <executorch/extension/tensor/tensor.h>
 
 using namespace ::executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 // Create a Module.
 Module module("/path/to/model.pte");
@@ -221,6 +222,7 @@ Use [ExecuTorch Dump](etdump.md) to trace model execution. Create an `ETDumpGen`
 #include <executorch/devtools/etdump/etdump_flatcc.h>
 
 using namespace ::executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 Module module("/path/to/model.pte", Module::LoadMode::MmapUseMlock, std::make_unique<ETDumpGen>());
 

docs/source/extension-tensor.md

@@ -11,6 +11,7 @@ Imagine you’re working with a [`Module`](extension-module.md) interface, and y
 
 using namespace executorch::aten;
 using namespace executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 SizesType sizes[] = {2, 3};
 DimOrderType dim_order[] = {0, 1};
@@ -42,6 +43,7 @@ Here’s how you can use it:
 #include <executorch/extension/tensor/tensor.h>
 
 using namespace executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 auto tensor = make_tensor_ptr(
     {2, 3},                                // sizes

docs/source/getting-started.md

@@ -194,6 +194,7 @@ Loading and running a model using the high-level API can be done as follows:
 #include <executorch/extension/tensor/tensor.h>
 
 using namespace ::executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 // Load the model.
 Module module("/path/to/model.pte");

docs/source/llm/getting-started.md

@@ -209,7 +209,7 @@ Create a file called main.cpp with the following contents:
 using executorch::aten::ScalarType;
 using executorch::aten::Tensor;
 using executorch::extension::from_blob;
-using executorch::extension::Module;
+using executorch::extension::ET_MODULE_NAMESPACE::Module;
 using executorch::runtime::EValue;
 using executorch::runtime::Result;
 ```

docs/source/using-executorch-cpp.md

@@ -13,6 +13,7 @@ In addition the Module class, the tensor extension provides an encapsulated inte
 #include <executorch/extension/tensor/tensor.h>
 
 using namespace ::executorch::extension;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 
 // Load the model.
 Module module("/path/to/model.pte");

examples/llm_manual/main.cpp

@@ -20,7 +20,7 @@
 using executorch::aten::ScalarType;
 using executorch::aten::Tensor;
 using executorch::extension::from_blob;
-using executorch::extension::Module;
+using executorch::extension::ET_MODULE_NAMESPACE::Module;
 using executorch::runtime::EValue;
 using executorch::runtime::Result;
 

examples/models/llama/runner/runner.cpp

@@ -21,7 +21,7 @@
 
 namespace example {
 
-using ::executorch::extension::Module;
+using ::executorch::extension::ET_MODULE_NAMESPACE::Module;
 using ::executorch::runtime::Error;
 using ::executorch::runtime::Result;
 

examples/models/llama/runner/runner.h

@@ -60,7 +60,7 @@ class ET_EXPERIMENTAL Runner : public executorch::extension::llm::IRunner {
   bool shouldStop_{false};
 
   // model
-  std::unique_ptr<::executorch::extension::Module> module_;
+  std::unique_ptr<::executorch::extension::ET_MODULE_NAMESPACE::Module> module_;
   std::string tokenizer_path_;
   std::unique_ptr<::tokenizers::Tokenizer> tokenizer_;
   std::unordered_map<std::string, int64_t> metadata_;

examples/models/llava/runner/llava_image_prefiller.h

@@ -18,7 +18,8 @@ namespace example {
 class ET_EXPERIMENTAL LlavaImagePrefiller
     : public ::executorch::extension::llm::ImagePrefiller {
  public:
-  explicit LlavaImagePrefiller(::executorch::extension::Module* module)
+  explicit LlavaImagePrefiller(
+      ::executorch::extension::ET_MODULE_NAMESPACE::Module* module)
       : ImagePrefiller(module){};
   /**
    * Prefill an LLM Module with the given image input.

examples/models/llava/runner/llava_text_decoder_runner.h

@@ -17,7 +17,8 @@ namespace example {
 class ET_EXPERIMENTAL LlavaTextDecoderRunner
     : public executorch::extension::llm::TextDecoderRunner {
  public:
-  explicit LlavaTextDecoderRunner(executorch::extension::Module* module)
+  explicit LlavaTextDecoderRunner(
+      executorch::extension::ET_MODULE_NAMESPACE::Module* module)
       : TextDecoderRunner(module, true) {}
 
   inline executorch::runtime::Result<executorch::aten::Tensor> step(