Feat make redirect status configurable

[wout]

Purpose

This PR implements the suggestion in #1837.

Description

It allows the default redirect status (previously hardcoded as 302) to be configured:

Lucky::Redirectable.configure do |config|
  config.redirect_status = 303
end

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation has been added and/or updated
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test

[jwoertink]

nice!