Run core tests in Safari. Partially addresses https://github.com/pyodide/pyodide/issues/989

It runs, but there are several test failures, I'll open separate issues about those.
# pyodide.ffi

```{eval-rst}
.. currentmodule:: pyodide.ffi

.. automodule:: pyodide.ffi
   :members:
   :autosummary:
   :autosummary-no-nesting:

.. automodule:: pyodide.ffi.wrappers
   :members:
   :autosummary:
   :autosummary-no-nesting:
```

# pyodide.ffi

```{eval-rst}
.. currentmodule:: pyodide.ffi

.. automodule:: pyodide.ffi
   :members:
   :autosummary:
   :autosummary-no-nesting:

.. automodule:: pyodide.ffi.wrappers
   :members:
   :autosummary:
   :autosummary-no-nesting:
```
