need `Trans.from_s` when loading port metadata from GDS

Not sure if this is user error but I'll jot it down. I'm loading a GDS file with v1 metadata in kfactory 0.13.3, like this:

kf.config.meta_format = "v1"

l = kf.KCLayout("Layout")
l.read("something.gds", update_kcl_meta_data="overwrite")

for cell in l.each_cell():
    l[cell.name]

(Sebastian, I can send you the GDS if you like; it was written with kfactory 0.9.3.)

When I get down to l[cell.name] it will crash because somewhere inside there is a Trans being passed around as a string instead of as a Trans object. Around line 1839 of kcell.py, I can make the error go away:

                    if trans:
                        _port.trans = trans # kdb.Trans.from_s(trans) instead will fix it

and I believe this has to be corrected in 4 places in the module to cover all the bases (not sure).

Here's the stack trace I get.

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
File [~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py:3490](http://localhost:8888/lab/tree/Projects/axon/~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py#line=3489), in KCLayout.__getitem__(self, obj)
   3489 try:
-> 3490     return self.kcells[self.layout.cell(obj).cell_index()]
   3491 except KeyError:

KeyError: 0

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
Cell In[6], line 7
      4 l.read("ch4_pch.gds", update_kcl_meta_data="overwrite")
      6 for cell in l.each_cell():
----> 7     l[cell.name]
      9 # l is now loaded.

File [~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py:3494](http://localhost:8888/lab/tree/Projects/axon/~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py#line=3493), in KCLayout.__getitem__(self, obj)
   3492     kdb_c = self.layout.cell(obj)
   3493     c = KCell(name=kdb_c.name, kcl=self, kdb_cell=self.layout.cell(obj))
-> 3494     c.get_meta_data()
   3495     return c
   3496 except Exception as exc:

File [~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py:1840](http://localhost:8888/lab/tree/Projects/axon/~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py#line=1839), in KCell.get_meta_data(self, meta_format)
   1830 _port = Port(
   1831     name=name,
   1832     width=width,
   (...)
   1837     info=_d.get("info", {}),
   1838 )
   1839 if trans:
-> 1840     _port.trans = trans #kdb.Trans.from_s(trans)
   1841 elif dcplx_trans:
   1842     _port.dcplx_trans = dcplx_trans

File [~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py:5101](http://localhost:8888/lab/tree/Projects/axon/~/Documents/Projects/axon/venv/lib/python3.12/site-packages/kfactory/kcell.py#line=5100), in Port.trans(self, value)
   5099 @trans.setter
   5100 def trans(self, value: kdb.Trans) -> None:
-> 5101     self._trans = value.dup()
   5102     self._dcplx_trans = None

AttributeError: 'str' object has no attribute 'dup'

gdsfactory / kfactory

need `Trans.from_s` when loading port metadata from GDS #333