Minimal RESP2 encoder/decoder used by FauxRedis.

This module is intentionally self-contained and does not depend on the rest of the application. It operates purely on binaries and iodata.

Supported types:

• simple strings – {:simple_string, binary} or the atom :ok
• errors – {:error, binary} or {:error, :noauth} etc.
• integers – {:integer, integer} or plain integers

• bulk strings – {:bulk, binary | nil} or plain binaries / nil

• arrays – {:array, list} or plain lists

The parser understands all of these forms and returns Elixir values:

• simple string → binary
• error → {:error, binary}
• integer → integer

• bulk → binary | nil

• array → list