add support for gateway response (#31)

* add support for gateway responses

Author: hong-yi

modules/gateway_response/README.md

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+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.9 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.20.0 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.20.0 |
+
+## Modules
+
+No modules.
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [aws_api_gateway_gateway_response.wrapper](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/api_gateway_gateway_response) | resource |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_gateway_responses"></a> [gateway\_responses](#input\_gateway\_responses) | map of gateway responses | `map(any)` | `{}` | no |
+| <a name="input_rest_api_id"></a> [rest\_api\_id](#input\_rest\_api\_id) | The ID of the REST API | `string` | `""` | no |
+
+## Outputs
+
+No outputs.

modules/gateway_response/main.tf

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+resource "aws_api_gateway_gateway_response" "wrapper" {
+  for_each = var.gateway_responses
+
+  rest_api_id   = var.rest_api_id
+  response_type = each.key
+  status_code   = each.value.status_code
+
+  response_templates  = each.value.response_templates
+  response_parameters = each.value.response_parameters
+}

modules/gateway_response/variables.tf

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+variable "rest_api_id" {
+  description = "The ID of the REST API"
+  type        = string
+  default     = ""
+}
+
+variable "gateway_responses" {
+  description = "map of gateway responses"
+  type        = map(any)
+  default     = {}
+}

modules/gateway_response/versions.tf

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+terraform {
+  required_version = ">= 1.9"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 5.20.0"
+    }
+  }
+}