chore: update clap to 4.5

[davlgd]

This PR migrates from Clap 3.2 to Clap 4.5, updating all deprecated APIs and syntax to follow Clap 4.x conventions.

Core Updates

Attribute syntax changes:

• value_name("FOO") → value_name = "FOO"
• conflicts_with("foo-bar") → conflicts_with("foo_bar") (underscore naming)
• requires("foo-bar") → requires("foo_bar")

Custom parsers:

• parse(try_from_str = func) → value_parser = clap::builder::ValueParser::new(func)
• Applied to parse_ttl, parse_duration, parse_rule, and parse_param

Path handling:

• Removed parse(from_os_str) for PathBuf arguments (auto-detected in Clap 4)

Type System Updates

Import changes:

• clap::PossibleValue → clap::builder::PossibleValue

Trait implementation:

• ValueEnum::to_possible_value() signature simplified (removed explicit lifetime)

Type derivations:

• Added Clone to Ttl enum for value_parser compatibility

I've tested this against tests from #76 and a bash script generating outputs of multiple commands to look for any differences. I didn't notice any, except those linked to different Clap 4.x helpers style.

[divarvel]

there’s a small formatting error it seems. could you run cargo fmt and update the pr please?