Change to support patching OpenerDirector objects in urllib

[xangma]

This change patches over the open method for any created urllib OpenerDirector objects with the urlopen method here. OpenerDirectors are used in astropy here.

[koenvo]

Thanks for this PR. As far as I can see this doesn't help astropy as it still tries to import ssl (https://github.com/astropy/astropy/blob/main/astropy/utils/data.py#L1199). This still fails.

[xangma]

Ah, I understand why my code works now.

The reason I patched OpenerDirector was to use pyscript to run the pyvo package - an astropy affiliated package. It makes an astropy function call to download a file when running the pyvo.registry.search function. When I set up pyscript with the py-config, I also import ssl, which works for some reason I can't remember unfortunately, and that allows that astropy urlopen function to work. Does this make sense?

Here is my test code:

<py-config>
    packages = ["pyvo", "ssl", "pyodide-http"] 
</py-config>

<py-script>
    import pyodide_http
    pyodide_http.patch_all()
    from pyvo import registry
    res = registry.search(servicetype = 'conesearch', waveband = 'UV')
    print(res)
</py-script>

I should say, it says pyodide-http in the py-config above, which will do a micropip install I think? In my local code it pointed to a locally compiled whl instead with this PR in it.