feat: Audit log APIs (#6434)

- Adds the appropriate APIs for Audit Logs.

ref: #6015

db/schema.rb

@@ -153,6 +153,28 @@ ActiveRecord::Schema.define(version: 2023_02_24_124632) do
     t.index ["message_id"], name: "index_attachments_on_message_id"
   end
 
+  create_table 'audits', force: :cascade do |t|
+    t.bigint 'auditable_id'
+    t.string 'auditable_type'
+    t.bigint 'associated_id'
+    t.string 'associated_type'
+    t.bigint 'user_id'
+    t.string 'user_type'
+    t.string 'username'
+    t.string 'action'
+    t.jsonb 'audited_changes'
+    t.integer 'version', default: 0
+    t.string 'comment'
+    t.string 'remote_address'
+    t.string 'request_uuid'
+    t.datetime 'created_at'
+    t.index %w[associated_type associated_id], name: 'associated_index'
+    t.index %w[auditable_type auditable_id version], name: 'auditable_index'
+    t.index ['created_at'], name: 'index_audits_on_created_at'
+    t.index ['request_uuid'], name: 'index_audits_on_request_uuid'
+    t.index %w[user_id user_type], name: 'user_index'
+  end
+
   create_table "automation_rules", force: :cascade do |t|
     t.bigint "account_id", null: false
     t.string "name", null: false