Add Prettier and auto-format files

[alessio-locatelli]

Since in the Python code you prefer single quotes ', in the Prettier config I specified "singleQuote": true for consistency. But I can revert the Prettier config to the default value (double quotes) if you want.

This PR can be reviewed by looking at the diff, or by looking at the commits one at a time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (84a5d90) 97.22% compared to head (ac512b8) 97.22%.

Additional details and impacted files

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##             main     #224   +/-   ##
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  Coverage   97.22%   97.22%           
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  Files          10       10           
  Lines        1010     1010           
  Branches      171      171           
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  Hits          982      982           
  Misses         18       18           
  Partials       10       10           

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[JWCook]

Looks good to me. Thanks!

The only thing I don't quite like about Prettier's markdown formatting is adding extra newlines around all code blocks, MyST directives, anchors, headings, etc. Do you know if that's configurable? If not, it's okay; I'd still prefer having the benefits of auto-formatting.

[alessio-locatelli]

The only thing I don't quite like about Prettier's markdown formatting is adding extra newlines around all code blocks, MyST directives, anchors, headings, etc. Do you know if that's configurable? If not, it's okay; I'd still prefer having the benefits of auto-formatting.

I was able to found only prettier/prettier#6491

I agree that tools like Black and Prettier could sometimes have more options, but the alternative is just another tool, because the benefits of auto-fixing and auto-formatting are too great compared to each contributor doing something unique.