Add annual reports for accounts (#28693)

app/lib/annual_report/most_reblogged_accounts.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class AnnualReport::MostRebloggedAccounts < AnnualReport::Source
+  SET_SIZE = 10
+
+  def generate
+    {
+      most_reblogged_accounts: most_reblogged_accounts.map do |(account_id, count)|
+                                 {
+                                   account_id: account_id,
+                                   count: count,
+                                 }
+                               end,
+    }
+  end
+
+  private
+
+  def most_reblogged_accounts
+    @account.statuses.reorder(nil).where(id: year_as_snowflake_range).where.not(reblog_of_id: nil).joins(reblog: :account).group('accounts.id').having('count(*) > 1').order(total: :desc).limit(SET_SIZE).pluck(Arel.sql('accounts.id, count(*) as total'))
+  end
+end