#0: Fix ttnn shared libs build (tenstorrent#17127)

### Problem description
Build using `--ttnn-shared-sublibs` was broken

### What's changed
Pybind uses hidden visibility, which causes a linker error for functions
defined in *.cpp files.
Defintions moved to header file. 

### Checklist
- [ ] Post commit CI
[passes](https://github.com/tenstorrent/tt-metal/actions/runs/13003713246)

ttnn/cpp/ttnn/tensor/shape/shape.hpp

@@ -62,8 +62,9 @@ class type_caster<ttnn::SimpleShape> {
 public:
     PYBIND11_TYPE_CASTER(ttnn::SimpleShape, _("SimpleShape"));
 
-    bool load(handle src, bool);
-    static handle cast(const ttnn::SimpleShape& src, return_value_policy /* policy */, handle /* parent */);
+    PYBIND11_EXPORT bool load(handle src, bool);
+    PYBIND11_EXPORT static handle cast(
+        const ttnn::SimpleShape& src, return_value_policy /* policy */, handle /* parent */);
 };
 }  // namespace detail
 }  // namespace PYBIND11_NAMESPACE