Added new module to disable FLoC

[jwoertink]

Purpose

Fixes #1486

Description

This adds a new module to optionally disable FLoC. Just include it in your app, and it will set the appropriate header.

class BrowserAction < Lucky::Action
  include Lucky::SecureHeaders::DisableFLoC
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

[matthewmcgarvey]

@jwoertink The connected issue was to disable FLoC by default. What are your thoughts on that?

[jwoertink]

Reading around at a few articles, it seems like this is just a google experiment that probably won't last, or may change. I wouldn't be surprised if this is removed by the holidays 😂

We can still do it by default by adding this module in to generated apps. Then if people want to opt in to this disable, they can just add the module in their BrowserAction for upgrades.

[edwardloveall]

I think it would be great to disable by default 🙂 It feels like the right thing to do and we want to be "batteries included" where it makes sense. I think it makes sense here!

[jwoertink]

ok, issue on CLI opened up! 👍