Hi,

this PR replaces prettier with dprint.

Reasons why:

• prettier is "too opinionated" for our taste, as we have noticed and discussed in chore: fix prettier code style issues #1283
• it only allows limited configuration

On the other hand - there is a lot more flexibility with dprint config:
https://dprint.dev/plugins/typescript/config

The rules still might need some fine-tuning, so I'll leave the PR in draft, until we agree on a final rule set maybe.

Currently I only have a config for TS/JS that looks like this, which is partially based on the previously used prettier config.

  "typescript": {
    "indentWidth": 4,
    "quoteStyle": "preferDouble",
    "semiColons": "prefer",
    "quoteProps": "asNeeded",
    "newLineKind": "lf",
    "lineWidth": 200,
    "trailingCommas": "never",
    "arrayPattern.spaceAround": true,
    "arrayExpression.spaceAround": true
  },