[Python] Add echo_api test object serialization for multipart requests (#18176)

* [python] echo add test object serialization for multipart requests

* [echo api] update samples

* [echo api] update samples

samples/client/echo_api/ruby-faraday/docs/FormApi.md

@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost:3000*
 | Method | HTTP request | Description |
 | ------ | ------------ | ----------- |
 | [**test_form_integer_boolean_string**](FormApi.md#test_form_integer_boolean_string) | **POST** /form/integer/boolean/string | Test form parameter(s) |
+| [**test_form_object_multipart**](FormApi.md#test_form_object_multipart) | **POST** /form/object/multipart | Test form parameter(s) for multipart schema |
 | [**test_form_oneof**](FormApi.md#test_form_oneof) | **POST** /form/oneof | Test form parameter(s) for oneOf schema |
 
 
@@ -78,6 +79,70 @@ No authorization required
 - **Accept**: text/plain
 
 
+## test_form_object_multipart
+
+> String test_form_object_multipart(marker)
+
+Test form parameter(s) for multipart schema
+
+Test form parameter(s) for multipart schema
+
+### Examples
+
+```ruby
+require 'time'
+require 'openapi_client'
+
+api_instance = OpenapiClient::FormApi.new
+marker = OpenapiClient::TestFormObjectMultipartRequestMarker.new # TestFormObjectMultipartRequestMarker | 
+
+begin
+  # Test form parameter(s) for multipart schema
+  result = api_instance.test_form_object_multipart(marker)
+  p result
+rescue OpenapiClient::ApiError => e
+  puts "Error when calling FormApi->test_form_object_multipart: #{e}"
+end
+```
+
+#### Using the test_form_object_multipart_with_http_info variant
+
+This returns an Array which contains the response data, status code and headers.
+
+> <Array(String, Integer, Hash)> test_form_object_multipart_with_http_info(marker)
+
+```ruby
+begin
+  # Test form parameter(s) for multipart schema
+  data, status_code, headers = api_instance.test_form_object_multipart_with_http_info(marker)
+  p status_code # => 2xx
+  p headers # => { ... }
+  p data # => String
+rescue OpenapiClient::ApiError => e
+  puts "Error when calling FormApi->test_form_object_multipart_with_http_info: #{e}"
+end
+```
+
+### Parameters
+
+| Name | Type | Description | Notes |
+| ---- | ---- | ----------- | ----- |
+| **marker** | [**TestFormObjectMultipartRequestMarker**](TestFormObjectMultipartRequestMarker.md) |  |  |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: multipart/form-data
+- **Accept**: text/plain
+
+
 ## test_form_oneof
 
 > String test_form_oneof(opts)

samples/client/echo_api/ruby-faraday/docs/TestFormObjectMultipartRequestMarker.md

@@ -0,0 +1,18 @@
+# OpenapiClient::TestFormObjectMultipartRequestMarker
+
+## Properties
+
+| Name | Type | Description | Notes |
+| ---- | ---- | ----------- | ----- |
+| **name** | **String** |  | [optional] |
+
+## Example
+
+```ruby
+require 'openapi_client'
+
+instance = OpenapiClient::TestFormObjectMultipartRequestMarker.new(
+  name: null
+)
+```
+