Replace black and flake8 with ruff

[timothy-nunn]

Update our codebase to use ruff as a formatter instead of black, and use ruff as a linter instead of flake8. The benefits of this change are:

• Faster linting and formatting.
• Unification of formatting and linting into one tool.
• Ability to enable future rules (e.g. import sorting) without additional tools.
• Parity with other open-source UKAEA codes like bluemira and PyVMCON.

The downsides could be merge conflicts in the short term.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.72072% with 88 lines in your changes missing coverage. Please review.

Project coverage is 29.56%. Comparing base (7844aa2) to head (c74892d).

Files with missing lines	Patch %	Lines
process/build.py	0.00%	30 Missing ⚠️
process/sctfcoil.py	0.00%	10 Missing ⚠️
process/io/sankey_funcs.py	0.00%	7 Missing ⚠️
process/physics.py	50.00%	6 Missing ⚠️
process/power.py	0.00%	6 Missing ⚠️
process/pfcoil.py	0.00%	4 Missing ⚠️
process/io/configuration.py	0.00%	3 Missing ⚠️
process/io/plot_proc.py	0.00%	3 Missing ⚠️
process/geometry/blanket_geometry.py	0.00%	2 Missing ⚠️
process/geometry/firstwall_geometry.py	0.00%	2 Missing ⚠️
... and 10 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3424   +/-   ##
=======================================
  Coverage   29.56%   29.56%           
=======================================
  Files          78       78           
  Lines       19131    19131           
=======================================
  Hits         5656     5656           
  Misses      13475    13475           

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[timothy-nunn]

Rules that are not going to be implemented but will be papercuts:
NPY, SLF, BLE, B, A, DTZ, EXE, ICN, PIE, RET, PD, PERF, FURB

[chris-ashe]

Minor spelling error

[chris-ashe]

Happy with doc changes