Add the 'embed' tag like in PebbleTemplate / Twig

[davy-claisse]

The embed tag is not part of Jinja2 or Django but originally part of Twig, which is a derived form of both.

The goal of this tag is to get the ability to pass parameters to the embedded template by using the with keyword, for instance:

We declared the following template in the file person.tera.

Hello {{ name }}!

The embed tag allows us to use it like this (without getting information from Tera Context):

{% embed "person.tera" with { "name" : "World" } %}
{% endembed %}

I can give two good documentations of this tag:

• https://pebbletemplates.io/wiki/tag/embed/
• https://twig.symfony.com/doc/3.x/tags/embed.html

[Keats]

Isn't that the same as include with specifying the context in Jinja2? Either way, Tera prefers using macros than includes so that is not going to be added