refactor: use clap value_enum replace some trait

[fan-tastic-z]

use value_enum replace some trait, At the same time, the help information is more friendly, and the enumeration types of parameters can be automatically listed.

Encode a string to base64

Usage: rcli base64 encode [OPTIONS]

Options:
  -i, --input <INPUT>    [default: -]
      --format <FORMAT>  [default: standard] [possible values: standard, urlsafe]
  -h, --help             Print help

Usage: rcli csv [OPTIONS] --input <INPUT>

Options:
  -i, --input <INPUT>          
  -o, --output <OUTPUT>        
      --format <FORMAT>        [default: json] [possible values: json, yaml]
  -d, --delimiter <DELIMITER>  [default: ,]
      --header                 
  -h, --help                   Print help

Usage: rcli text sign [OPTIONS] --key <KEY>

Options:
  -i, --input <INPUT>    [default: -]
  -k, --key <KEY>        
      --format <FORMAT>  [default: blake3] [possible values: blake3, ed25519]
  -h, --help             Print help