Make the sphinx autodoc documents evaluate last

[LecrisUT]

This is quite a nasty hidden issue. Because both sphinx and tmt are using annotations, if sphinx imports tmt first, it will affect the code when we actually want to evaluate the tmt modules.

I could not find a way around it and until upstream offers some interface https://github.com/sphinx-doc/sphinx/issues/14010, this is the best workaround that we can do.

Depends on: #3977