Add current_page? helper method to pages and components

[paulcsmith]

This will be used by #969

Should work similarly to Rails https://apidock.com/rails/ActionView/Helpers/UrlHelper/current_page%3F

current_page?(User::Index)
current_page?(Users::Show.with(user.id))
current_page?("/raw/string")

By default it should not care about query params but passing check_query_params: true will include the path and query params

cc @wout

[wout]

@paulcsmith Do you want it to work for full uri's, including scheme, host and port? Or only for path or path + query?

[paulcsmith]

@wout Great question. I think host, scheme and port should be options. But I'd also be ok shipping those in a separate PR to get the basic use case of path done. Up to you though!

[wout]

Ok, I'll have a look at host and port as well. However, I need a pointer here since Crystal's HTTP::Request does not carry scheme information. Is it available somewhere in Lucky?

I was also wondering if it is relevant these days. I don't know all the use cases, but isn't it either http or https? And if so, since https is becoming a requirement these days, should we even test on scheme?

[paulcsmith]

@wout Great point. We can skip that I think. Everyone should be using ssl and Lucky makes it easy to force with the ForceSslHandler. Also scheme shouldn't change what page is shown as long as the rest of the host and path match 👍

[wout]

@paulcsmith That's done then. :)