Add support for es modules, fixes #1413 (#1414)

* Add support for es modules, fixes #1413

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: timkpaine

voila/utils.py

@@ -264,8 +264,11 @@ def include_css(template_name: str, base_url: str, name: str) -> str:
     return Markup(code)
 
 
-def include_js(template_name: str, base_url: str, name: str) -> str:
-    code = f'<script src="{make_url(template_name, base_url, name)}"></script>'
+def include_js(
+    template_name: str, base_url: str, name: str, module: bool = False
+) -> str:
+    type = 'type="module"' if module else ""
+    code = f'<script src="{make_url(template_name, base_url, name)}" {type}></script>'
     return Markup(code)