Support for Jinja template files

[schewara]

It would be really practical if the extension would also be active for specific Jinja templates, like .sh.j2 and other supported files,
as listed at:

https://open-vsx.org/extension/samuelcolvin/jinjahtml#languages%3A

Especially when working with Ansible and dynamically generated Files, this feature would improve the workflow quite a bit.