fix: railtie loading to prevent calling methods that have not yet been defined

[bibendi]

Hey!

In some cases (e.g., testing with optional dependencies) Yabeda may be loaded after a dummy Rails app is loaded. So, it as the common way to requre railties as late as possible.

NoMethodError:
  undefined method `already_configured?' for module Yabeda
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda/railtie.rb:7:in `block in <class:Railtie>'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:94:in `block in execute_hook'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:87:in `with_execution_control'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:92:in `execute_hook'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:62:in `block in on_load'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:61:in `each'
# /usr/local/bundle/ruby/3.3.0/gems/activesupport-7.2.1/lib/active_support/lazy_load_hooks.rb:61:in `on_load'
# /usr/local/bundle/ruby/3.3.0/gems/railties-7.2.1/lib/rails/railtie/configuration.rb:71:in `after_initialize'
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda/railtie.rb:6:in `<class:Railtie>'
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda/railtie.rb:5:in `<module:Rails>'
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda/railtie.rb:4:in `<module:Yabeda>'
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda/railtie.rb:3:in `<top (required)>'
# /usr/local/bundle/ruby/3.3.0/gems/zeitwerk-2.6.18/lib/zeitwerk/kernel.rb:34:in `require'
# /usr/local/bundle/ruby/3.3.0/gems/yabeda-0.12.0/lib/yabeda.rb:11:in `<top (required)>'

[bibendi]

@Envek

[Envek]

Released in 0.13.0, thanks!