Improvements to IPConnection

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 20 lines in your changes missing coverage. Please review.

Project coverage is 45.03%. Comparing base (2d9657f) to head (b7f6601). Report is 28 commits behind head on main.

Files	Patch %	Lines
src/fastcs/connections/ip_connection.py	50.00%	20 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #26 +/- ## ========================================== + Coverage 43.96% 45.03% +1.06% ========================================== Files 18 18 Lines 655 675 +20 ========================================== + Hits 288 304 +16 - Misses 367 371 +4 ```

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[OCopping]

If you two are happy with the decorator approach to try and clean up the functions inside Connection objects, I might try and move them into a separate script to then be imported. I would have to make them more generalised though (e.g. instead of looking at self._reader and self,_writer in _ensure_connected, I could set a new self._connected variable in the object that could be used in every new Connection object too)

I have tested similar decorators in pythonSoftIOCs I have written recently and they worked nicely.