feat: add printfn/fend

[CrystalMethod]

printfn/fend: Arbitrary-precision unit-aware calculator

$ aqua g -i printfn/fend

How to confirm if this package works well

Reviewers aren't necessarily familiar with this package, so please describe how to confirm if this package works well.
Please confirm if this package works well yourself as much as possible.

Command and output

$ fend --help
For more information on how to use fend, please take a look at the manual:
https://printfn.github.io/fend/documentation/

Version: 1.1.5
Config file: /Users/lars/.config/fend/config.toml
History file: /Users/lars/.local/state/fend/history
Cache directory: /Users/lars/.cache/fend

[suzuki-shunsuke]

Thank you always!

[suzuki-shunsuke]

Released. https://github.com/aquaproj/aqua-registry/releases/tag/v3.144.0