add oxford instruments driver and examples ITC503 temperature controller

[thealohaprotocal]

@astafan8 and @jenshnielsen could you please have a look.

[jenshnielsen]

@thealohaprotocal sorry for the delayed response. Your 2 other prs have landed. This one has 2 minor issues.

/home/runner/work/Qcodes_contrib_drivers/Qcodes_contrib_drivers/docs/examples/OxfordInstruments/ITC_503.ipynb: WARNING: document isn't included in any toctree

The OxfordInstruments folder needes to be added along with the other foldders to the index.rst file in the folder above for this notebook to become part of the docs.

There are some missing type annotations. Can you add these?

Run mypy src
src/qcodes_contrib_drivers/drivers/SwabianInstruments/private/time_tagger.py:67:17: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
src/qcodes_contrib_drivers/drivers/OxfordInstruments/ITC503.py:27:9: error: Need type annotation for "_values" (hint: "_values: dict[<type>, <type>] = ...")  [var-annotated]
src/qcodes_contrib_drivers/drivers/OxfordInstruments/ITC503.py:[14](https://github.com/QCoDeS/Qcodes_contrib_drivers/actions/runs/13859013079/job/38782545157?pr=395#step:7:15)6:5: error: Missing return statement  [return]
src/qcodes_contrib_drivers/drivers/OxfordInstruments/ITC503.py:158:5: error: Missing return statement  [return]
src/qcodes_contrib_drivers/drivers/OxfordInstruments/ITC503.py:170:5: error: Missing return statement  [return]
src/qcodes_contrib_drivers/drivers/Horiba/Horiba_FHR.py:38:9: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
Found 4 errors in 1 file (checked 207 source files)