LoggerSilence support within Rails

[kares]

second attempt at Rails' LoggerSilence (based on what was initially suggested #270), an alternative for #303

the previous approach made more sense but we can not really singleton_class.send(:include, ActiveSupport::LoggerSilence), in actual Rails...

(TypeError) module attributes should be defined directly on class, not singleton
	at RUBY.mattr_reader(/opt/local/rvm/gems/jruby-9.4.13.0@temp/gems/activesupport-7.2.2.1/lib/active_support/core_ext/module/attribute_accessors.rb:56)
	at RUBY.mattr_accessor(/opt/local/rvm/gems/jruby-9.4.13.0@temp/gems/activesupport-7.2.2.1/lib/active_support/core_ext/module/attribute_accessors.rb:210)
	at RUBY.LoggerSilence(/opt/local/rvm/gems/jruby-9.4.13.0@temp/gems/activesupport-7.2.2.1/lib/active_support/logger_silence.rb:12)
	at org.jruby.RubyModule.module_eval(org/jruby/RubyModule.java:3723)
	at org.jruby.RubyModule.module_eval(org/jruby/RubyModule.java:3754)
	at RUBY.append_features(/opt/local/rvm/gems/jruby-9.4.13.0@temp/gems/activesupport-7.2.2.1/lib/active_support/concern.rb:138)
	at org.jruby.RubyModule.include(org/jruby/RubyModule.java:3384)
	at RUBY.Railtie(uri:classloader:/jruby/rack/rails/railtie.rb:43)