[microTVM][Arduino] Cleanup template directory

[mehrdadh]

This PR restructures the template project for Arduino as part of adding Arduino to TVM package efforts.

[mehrdadh]

cc @gromero @guberti @areusch

[areusch]

@guberti @gromero can you take a look when you get a minute?

[gromero]

@mehrdadh LGTM. Just a nit in README.md. Check if it's missing something please. Thanks!

[gromero]

@mehrdadh BTW, I found out that the following fixes are needed in Arduino while reviewing your changes, but naturally your changes are independent. I'll submit them later today:

Author: Gustavo Romero <gustavo.romero@linaro.org>
Date:   Mon Oct 18 21:25:26 2021 +0000

    Fix Arduino

diff --git a/apps/microtvm/arduino/template_project/microtvm_api_server.py b/apps/microtvm/arduino/template_project/microtvm_api_server.py
index 3d25d0bca..85263137f 100644
--- a/apps/microtvm/arduino/template_project/microtvm_api_server.py
+++ b/apps/microtvm/arduino/template_project/microtvm_api_server.py
@@ -152,7 +152,9 @@ class Handler(server.ProjectAPIHandler):
         return server.ServerInfo(
             platform_name="arduino",
             is_template=IS_TEMPLATE,
-            model_library_format_path=MODEL_LIBRARY_FORMAT_PATH,
+            model_library_format_path=""
+            if IS_TEMPLATE
+            else MODEL_LIBRARY_FORMAT_PATH,
             project_options=PROJECT_OPTIONS,
         )
 
@@ -352,7 +354,7 @@ class Handler(server.ProjectAPIHandler):
 
         # Unpack the MLF and copy the relevant files
         metadata = self._disassemble_mlf(model_library_format_path, source_dir)
-        shutil.copy2(model_library_format_path, source_dir / "model")
+        shutil.copy2(model_library_format_path, project_dir / MODEL_LIBRARY_FORMAT_RELPATH)
 
         # For AOT, template model.h with metadata to minimize space usage
         if options["project_type"] == "example_project":

[mehrdadh]

@gromero thanks for the review! PTAL.

[gromero]

Thanks @mehrdadh LGTM!

[areusch]

thanks @mehrdadh !