feat: Audit log APIs (#6434)

- Adds the appropriate APIs for Audit Logs.

ref: #6015

enterprise/app/models/enterprise/audit/account.rb

@@ -0,0 +1,7 @@
+module Enterprise::Audit::Account
+  extend ActiveSupport::Concern
+
+  included do
+    has_associated_audits
+  end
+end

enterprise/app/models/enterprise/audit/automation_rule.rb

@@ -0,0 +1,7 @@
+module Enterprise::Audit::AutomationRule
+  extend ActiveSupport::Concern
+
+  included do
+    audited associated_with: :account
+  end
+end

enterprise/app/models/enterprise/audit/inbox.rb

@@ -0,0 +1,7 @@
+module Enterprise::Audit::Inbox
+  extend ActiveSupport::Concern
+
+  included do
+    audited associated_with: :account
+  end
+end

enterprise/app/models/enterprise/audit/webhook.rb

@@ -0,0 +1,7 @@
+module Enterprise::Audit::Webhook
+  extend ActiveSupport::Concern
+
+  included do
+    audited associated_with: :account
+  end
+end

enterprise/app/models/enterprise/audit_log.rb

@@ -0,0 +1,11 @@
+class Enterprise::AuditLog < Audited::Audit
+  after_save :log_additional_information
+
+  private
+
+  def log_additional_information
+    # rubocop:disable Rails/SkipsModelValidations
+    update_columns(username: user&.email)
+    # rubocop:enable Rails/SkipsModelValidations
+  end
+end