Update to Prettier 3

[remcohaszing]

What does this PR do?

This updates Prettier to version 3.

• Prettier 3 is async, so related functions were made async.
• Code was reformatted using Prettier.
• Prettier now ships their own types, so @types/prettier was removed.
• Prettier was moved to dependencies. optionalDependencies is for dependencies that have a install script that may fail. This isn’t the case for Prettier.
• eslint-plugin-prettier was updated as well.

Alternatively the formatting functionality could be removed. IMO people should just use Prettier themselves for formatting YAML instead of relying on this yaml-language-server.

What issues does this PR fix or reference?

N/A

Is it tested? How?

npm test

[coveralls]

coverage: 84.181% (+0.007%) from 84.174% when pulling 678e80a588ffc13ad33b5187adcbdb41714da7cc on remcohaszing:prettier-3 into f039273ee5b6974db5ad34b03bb24cfe09b64447 on redhat-developer:main.

[artola]

@msivasubramaniaan This would be a nice enhancement to support Prettier v3, otherwise we are forced deliver 2 versions of Prettier within our app.