fixed map import for api and model templates in jaxrs-resteasy generator

Author: HugoMario

src/main/resources/handlebars/JavaJaxRS/resteasy/apiService.mustache

@@ -9,6 +9,7 @@ import {{package}}.*;
 {{/imports}}
 
 import java.util.List;
+import java.util.Map;
 import {{package}}.NotFoundException;
 
 import java.io.InputStream;

src/main/resources/handlebars/JavaJaxRS/resteasy/apiServiceImpl.mustache

@@ -9,6 +9,7 @@ import {{package}}.*;
 {{/imports}}
 
 import java.util.List;
+import java.util.Map;
 import {{package}}.NotFoundException;
 
 import java.io.InputStream;

src/main/resources/handlebars/JavaJaxRS/resteasy/model.mustache

@@ -3,6 +3,7 @@ package {{package}};
 {{^x-is-composed-model}}
 import java.util.Objects;
 import java.util.ArrayList;
+import java.util.HashMap;
 {{#imports}}import {{import}};
 {{/imports}}
 {{#serializableModel}}