Add method to capture samesite for cookies and return the cookie

[jwoertink]

Purpose

Fixes #1176

Description

Lucky::CookieJar.configure do |settings|
  settings.on_set = ->(cookie : HTTP::Cookie) {
    cookie.secure(Lucky::ForceSSLHandler.settings.enabled)
    cookie.http_only(true)
    cookie.samesite(:strict)
  }
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

[paulcsmith]

Niiicee! Looks good

[paulcsmith]

Perfect! 🥳