fold monarch_meta_extension into monarch_hyperactor (#476)

Summary:
Pull Request resolved: #476

Kill the separate meta-only extension and fold it into the main monarch_extension, using conditional compilation to gate it.

This eliminates an extra crate/shared object from our codebase.
ghstack-source-id: 295034950
exported-using-ghexport

Reviewed By: colin2328

Differential Revision: D77972861

fbshipit-source-id: 380d0ddfbac860b02f0b83f841d11c151ada9cd9

Author: suo

monarch_extension/src/lib.rs

@@ -189,6 +189,17 @@ pub fn mod_init(module: &Bound<'_, PyModule>) -> PyResult<()> {
         "monarch_extension.blocking",
     )?)?;
 
+    #[cfg(fbcode_build)]
+    {
+        monarch_hyperactor::meta::alloc::register_python_bindings(&get_or_add_new_module(
+            module,
+            "monarch_hyperactor.meta.alloc",
+        )?)?;
+        monarch_hyperactor::meta::alloc_mock::register_python_bindings(&get_or_add_new_module(
+            module,
+            "monarch_hyperactor.meta.alloc_mock",
+        )?)?;
+    }
     // Add feature detection function
     module.add_function(wrap_pyfunction!(has_tensor_engine, module)?)?;
 

monarch_hyperactor/src/lib.rs

@@ -21,3 +21,6 @@ pub mod proc_mesh;
 pub mod runtime;
 pub mod selection;
 pub mod shape;
+
+#[cfg(fbcode_build)]
+pub mod meta;