fix(go-sdk): dont escape HTML characters in conditions

The behaviour of json.Marshal is to escape any HTML characters in a string, by using json.Encoder
we are able to disable the escaping of these characters

config/clients/go/template/model.mustache

@@ -3,6 +3,12 @@ package {{packageName}}
 
 {{#models}}
 import (
+{{#model}}
+{{^isEnum}}
+	"bytes"
+{{/isEnum}}
+{{/model}}
+
 	"encoding/json"
 {{#imports}}
 	"{{import}}"

config/clients/go/template/model_simple.mustache

@@ -277,7 +277,14 @@ func (o {{classname}}) MarshalJSON() ([]byte, error) {
 	}
 
 	{{/isAdditionalPropertiesTrue}}
-	return json.Marshal(toSerialize)
+	var b bytes.Buffer
+	enc := json.NewEncoder(&b)
+	enc.SetEscapeHTML(false)
+	err := enc.Encode(toSerialize)
+	if err != nil {
+		return nil, err
+	}
+	return b.Bytes(), nil
 }
 
 {{#isAdditionalPropertiesTrue}}