Add annual reports for accounts (#28693)

app/lib/annual_report/most_used_apps.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class AnnualReport::MostUsedApps < AnnualReport::Source
+  SET_SIZE = 10
+
+  def generate
+    {
+      most_used_apps: most_used_apps.map do |(name, count)|
+                        {
+                          name: name,
+                          count: count,
+                        }
+                      end,
+    }
+  end
+
+  private
+
+  def most_used_apps
+    @account.statuses.reorder(nil).where(id: year_as_snowflake_range).joins(:application).group('oauth_applications.name').order(total: :desc).limit(SET_SIZE).pluck(Arel.sql('oauth_applications.name, count(*) as total'))
+  end
+end