Change user settings to be stored in a more optimal way (#23630)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/models/user_settings/setting.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+class UserSettings::Setting
+  attr_reader :name, :namespace, :in
+
+  def initialize(name, options = {})
+    @name          = name.to_sym
+    @default_value = options[:default]
+    @namespace     = options[:namespace]
+    @in            = options[:in]
+  end
+
+  def default_value
+    if @default_value.respond_to?(:call)
+      @default_value.call
+    else
+      @default_value
+    end
+  end
+
+  def type
+    if @default_value.is_a?(TrueClass) || @default_value.is_a?(FalseClass)
+      ActiveModel::Type::Boolean.new
+    else
+      ActiveModel::Type::String.new
+    end
+  end
+
+  def type_cast(value)
+    if type.respond_to?(:cast)
+      type.cast(value)
+    else
+      value
+    end
+  end
+
+  def to_a
+    [key, default_value]
+  end
+
+  def key
+    if namespace
+      "#{namespace}.#{name}".to_sym
+    else
+      name
+    end
+  end
+end