Readd session errors

[tak1n]

Somewhat unhappy with the implementation, but this introduces some tests as well on which we can rely on to refactor this. Feel free to suggest improvements, maybe we could leverage Hanami::Action::Configuration here.

The configuration is already injected into the response object, we could take care to inject it into the request object as well.

Closes https://github.com/hanami/controller/issues/256

[tak1n]

Re-add helpful errors when session is accessed off response, but sessions are not enabled

[jodosha]

@tak1n Could you please rebase with main? 🙏

[tak1n]

@jodosha done, also fixed remaining rubocop offenses.

[timriley]

Fixed in #395.