fix: GDS export wrappers in JaxSimulation (#1334)

[yaugenst-flex]

Fixes #1334 by overriding to_gds() in JaxSimulation to call self.to_simulation() first. Addresses both to_gds() and to_gds_file() this way.

[tylerflex]

just took a quick look, could we also add

1. the other gds conversion methods (I think there's also to_gds_file(), might be one or two more but that's the main one people will use I think).
2. Just copy over the docstring from the original methods so people can see the parameters (I realize this is kind of ugly but it's what we have until we can better refactor things).
3. Add a line in the changelog under "added" in "unreleased"

Thanks!

[yaugenst-flex]

Hey @tylerflex, to_gds_file() works and is actually what's being tested, since it calls to_gds() internally. I'll add the docstring and changelog notes.

[yaugenst-flex]

Ah, but to_gdstk() and to_gdspy() probably won't work like this, you're right.

[tylerflex]

oh I see. hm, maybe we dont need the specific gdstk and gdspy ones but if you're already working on them, it wouldn't hurt. Good to know that the to_gds_file will work automatically, I guess just mention all of them that will work from JaxSimulation now in the changelog and should be good.

[tylerflex]

Looks good to me, thanks @yaugenst-flex , just a couple minor comments and also please squash the commits to 1 (or 2 maybe with one of them to fix the gds{py, tk} methods) if possible). Thanks!

[yaugenst-flex]

please squash the commits to 1 (or 2 maybe with one of them to fix the gds{py, tk} methods) if possible)

Done!

[tylerflex]

Looks great! thanks @yaugenst-flex . I will merge once the tests pass!