go-server: Support additional properties as command line arguments (#1555)

* Support additionalPorperties as command line arguments

* Move Readme into main dir

* Update Mustache

* Update sample

* Test coverage

* Move cli options

* Revert options

* Remove tabs

* openapi 3 examples

* Update readme

* serverPort to int

* Move package version cli option to AbstractGoCodegen

* Update samples

* Tab to spaces

* Update docs and sample with xml

* Manual update doc

* Another doc try

* Regenerate go-gin-server doc

samples/server/petstore/go-api-server/go/model_inline_object.go

@@ -0,0 +1,19 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * API version: 1.0.0
+ * Generated by: OpenAPI Generator (https://openapi-generator.tech)
+ */
+
+package petstoreserver
+
+type InlineObject struct {
+
+	// Updated name of the pet
+	Name string `json:"name,omitempty"`
+
+	// Updated status of the pet
+	Status string `json:"status,omitempty"`
+}

samples/server/petstore/go-api-server/go/model_inline_object_1.go

@@ -0,0 +1,23 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * API version: 1.0.0
+ * Generated by: OpenAPI Generator (https://openapi-generator.tech)
+ */
+
+package petstoreserver
+
+import (
+	"os"
+)
+
+type InlineObject1 struct {
+
+	// Additional data to pass to server
+	AdditionalMetadata string `json:"additionalMetadata,omitempty"`
+
+	// file to upload
+	File **os.File `json:"file,omitempty"`
+}