Add Ruff rules for PEP naming

[VeckoTheGecko]

Picked up some inconsistencies in our code along the way which was nice!

See commit history for changes, and see updated pyproject.toml for updated rules.

Fixes #2457

Notable changes:

• renamed applyConversion to apply_conversion in Field and VectorField .eval() methods

[VeckoTheGecko]

Also added a rule PGH004 in 799db8d .

This prevents the blanket use of noqa comments - this makes it specific which rule we want to ignore. So if there are multiple violations on a line, we only ignore the one we want.

For example,

- import parcels  # noqa
+ import parcels  # noqa: E402

Do you think that's ok @erikvansebille ? It would have the additional step of copying the code from the pre-commit output and pasting it next to noqa:
e.g,

E402 Module level import not at top of file
  --> docs/conf.py:96:1
   |
94 | #
95 | # The short X.Y version.
96 | import parcels
   | ^^^^^^^^^^^^^^
97 |
98 | version = parcels.__version__

[erikvansebille]

Looks good to me!