message: Align CODEOWNERS with new package structure
diff: /xain/fl/ @danieljanes
  /xain/grpc/ @r-marques
  /xain/helpers/ @danieljanes @tanertopal
  -/xain/ops/ @tanertopal
  /xain/types/ @danieljanes @tanertopal
  ## Benchmarks
  /benchmarks/benchmark/ @danieljanes @tanertopal
  /benchmarks/generator/ @tanertopal
  +/benchmarks/ops/ @tanertopal
  ## Rust packages
  /rust/ @r-marques @skade @stjepang @matklad @spacejam
  