feat: Add support for account abuse detection (#11001)

This PR adds service to automate account abuse detection. Currently
based on the signup name and URL, could potentially add more context
such as usage analysis, message metadata etc.

app/models/account.rb

@@ -2,18 +2,20 @@
 #
 # Table name: accounts
 #
-#  id                    :integer          not null, primary key
-#  auto_resolve_duration :integer
-#  custom_attributes     :jsonb
-#  domain                :string(100)
-#  feature_flags         :bigint           default(0), not null
-#  limits                :jsonb
-#  locale                :integer          default("en")
-#  name                  :string           not null
-#  status                :integer          default("active")
-#  support_email         :string(100)
-#  created_at            :datetime         not null
-#  updated_at            :datetime         not null
+#  id                         :integer          not null, primary key
+#  auto_resolve_duration      :integer
+#  contactable_contacts_count :integer          default(0)
+#  custom_attributes          :jsonb
+#  domain                     :string(100)
+#  feature_flags              :bigint           default(0), not null
+#  internal_attributes        :jsonb            not null
+#  limits                     :jsonb
+#  locale                     :integer          default("en")
+#  name                       :string           not null
+#  status                     :integer          default("active")
+#  support_email              :string(100)
+#  created_at                 :datetime         not null
+#  updated_at                 :datetime         not null
 #
 # Indexes
 #