Call prettier and get its config, then pick out the options we use or differ, then save to .oxfmtrc.jsonc

Migration

• If printWidth specified, use it as-is.
  • Otherwise, set printWidth: 80 for prettier's default
• Warn or comment out not supported format options like experimentalXxx
• Warn meta-transform plugins may not be applied?
• Anything else?

Consideration

• First, we need to understand prettier API for config resolution
  • IIRC, prettier.resolveConfig() requires file path, because their config is resolved by each target file
  • In that case, which file path to be targeted?
  • We do not support nested config, always target root(cwd) config?