Bugfix: Restore native in __init__.py

[psobolewskiPhD]

Over at https://github.com/napari/napari
We're getting test failures due to a validation error:
napari/napari#6121

napari/utils/events/evented_model.py:246: in __init__
    super().__init__(**kwargs)
pydantic/main.py:341: in pydantic.main.BaseModel.__init__
    ???
E   pydantic.error_wrappers.ValidationError: 1 validation error for Theme
E   syntax_style
E     Incorrect `syntax_style` value: native provided. Please use one of the following:  abap, algol, algol_nu, arduino, autumn, bw, borland, colorful, default, dracula, emacs, fruity, friendly, friendly_grayscale, github-dark, gruvbox-dark, gruvbox-light, igor, inkpot, lightbulb, lilypond, lovelace, manni, material, monokai, murphy, nord, nord-darker, one-dark, paraiso-dark, paraiso-light, pastie, perldoc, rainbow_dash, rrt, sas, solarized-dark, solarized-light, staroffice, stata, stata-dark, stata-light, tango, trac, vim, vs, xcode, zenburn
E   assert 'native' in {'abap': 'abap::AbapStyle', 'algol': 'algol::AlgolStyle', 'algol_nu': 'algol_nu::Algol_NuStyle', 'arduino': 'arduino::ArduinoStyle', ...} (type=assertion_error)

Investigating, I noticed that in PR #2443 native was dropped from the list. I assume it was not intentional, because the style itself does not appear to have been removed:
https://github.com/pygments/pygments/blob/master/pygments/styles/native.py

So in this PR I re-add 'native': 'native::NativeStyle', to the list in the proper alphabetical spot.
This fixes our issues in napari.

[jeanas]

Thank you. @Anteru Are you available for a hotfix release?

[Anteru]

Yeah, I was just about to do one :( Just double-checking we didn't throw away more styles in that PR.

[Anteru]

Turns out the style map wasn't even sorted properly ... what a mess 😢

[Anteru]

Shipped as 2.16.1. Sorry for the inconvenience -- looks like we need some better test strategy for the style map, given people can edit this manually and it should be possible to iterate over all files in styles/*, get all classes derived from Style, and verify against that list.

[jeanas]

Yeah, we can probably do the same for styles as we're doing with tox -e mapfiles for lexers and formatters.

[Anteru]

We can and we should :)

[psobolewskiPhD]

Thanks y'all, really appreciate such a quick response and on a weekend no less.
❤️