Simvue doesnt work in Python 3.10 in Conda

[wk9874]

When using (Bluemira's) conda installation with Python 3.10, I get this error on importing Simvue:

  File "/home/wk9874/Documents/bluemira/examples/optimisation/test.py", line 9, in <module>
    import simvue
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/__init__.py", line 1, in <module>
    from simvue.client import Client as Client
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/client.py", line 21, in <module>
    from simvue.api.objects.alert.base import AlertBase
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/api/objects/__init__.py", line 11, in <module>
    from .administrator import Tenant as Tenant, User as User
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/api/objects/administrator/__init__.py", line 10, in <module>
    from .tenant import Tenant as Tenant
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/api/objects/administrator/tenant.py", line 16, in <module>
    from simvue.api.objects.base import write_only, SimvueObject, staging_check
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/api/objects/base.py", line 128, in <module>
    class SimvueObject(abc.ABC):
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/site-packages/simvue/api/objects/base.py", line 321, in SimvueObject
    ) -> typing.Generator[tuple[str, Self | None], None, None]:
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 390, in __or__
    return Union[self, other]
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 312, in inner
    return func(*args, **kwds)
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 403, in __getitem__
    return self._getitem(self, parameters)
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 515, in Union
    parameters = tuple(_type_check(p, msg) for p in parameters)
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 515, in <genexpr>
    parameters = tuple(_type_check(p, msg) for p in parameters)
  File "/home/wk9874/micromamba/envs/bluemira/lib/python3.10/typing.py", line 171, in _type_check
    raise TypeError(f"Plain {arg} is not valid as type argument")
TypeError: Plain typing.Self is not valid as type argument

[wk9874]

Can fix this by adding a TypeVar:

T = typing.TypeVar('T', bound='SimvueObject')

And replace Self in the typing of the generator above with:

typing.Generator[tuple[str, T | None], None, None]

I think we only need to implement it in this one location, as everywhere else that uses Self in typing doesn't put it in a complex data type like a Generator