chore: Create benchmarks for high-level parsers

[duesee]

• Detect regressions
  • Scenario(s)
  • Greeting
    • [x] parse_simple
    • [x] parse_complex
    • [x] serialize_simple
    • [x] serialize_complex
  • Command
    • [x] parse_simple
    • [x] parse_complex
    • [x] serialize_simple
    • [x] serialize_complex
  • Response
    • [x] parse_simple
    • [x] parse_complex
    • [x] serialize_simple
    • [x] serialize_complex
  • Trace from https://datatracker.ietf.org/doc/html/rfc3501#section-8
    • [x] trace_parse
    • [x] trace_serialize
  • [x] Introduce just benchmark against main
• Compare with imap-proto and Stalwart's imap-proto