Add a new Component for PSR7 Http Cache + PSR15 Middleware

[prisis]

Utils that can be used
https://github.com/micheh/psr7-cache

Optional Features

• Send cache invalidation requests with minimal impact on performance.
• Cache tagging abstraction, uses BAN with Varnish and allows tagging support for other caching proxies in the future.
• Use the built-in support for Varnish 3, 4 and 5, NGINX, the Symfony reverse proxy from the http-kernel component or easily implement your own caching proxy client.
• Test your application against your Varnish or NGINX setup.
• https://hacks.mozilla.org/2017/01/using-immutable-caching-to-speed-up-the-web/

[Nyholm]

Oh, that is great

[prisis]

First i need to finish my old tickets :D (the day needs more hours haha)