isConnectionSecure() is duplicate code from @fastify/cookie/plugin.js

[U-4-E-A]

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Issue

I am currently reworking the session package and noticed that isConnectionSecure() is duplicated from @fastify/cookie/plugin.js. I want to keep my code D.R.Y. but it is not available as export from the cookie package.

This could be added as an export from the cookie package or a better solution (as this is a test on the Request object) might be to add it as an exported function in the main fastify package. This will centralise the code, avoid W.E.T. and also allow me to delete the function in my own package and simply import it from the main fastify package instead. Thanks.

[mcollina]

Sure thing, could you send a PR?

[gurgunday]

Closed by #238