Prettier Phase 1: Prettier Configuration, Prettifying of files and documentation

What does this MR do?

• Adds Matching Prettier Configuration
• Adds Script to prettify all changed files or all files (This will then be used later through pre-commit)
• Updates our ESLint Rules to match Prettier formatting
• Adds Documentation about prettier and how to activate it in your editor

Removed the following ESLint rules to make it Prettier compatible (common to deactivate those):

"no-mixed-operators": 0, "space-before-function-paren": 0, "curly": 0, "arrow-parens": 0,

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides

What are the relevant issue numbers?

#41656 (moved)