[TASK] Make template serialization consistent with other component's serialization

[blythed]

Currently we have _builds nested x2 inside a template.encode() this is not elegant, and makes the editing of a template for a user difficult.

Instead we should have a single _builds field which combines everything from a Template in one field.

We should repurpose the Component.literals which stops the jobs being deployed on db.apply(template).

Outcome

This will make it easier to pass a response to the frontend, and deserialize without custom logic.

1. /db/show_template will not be necessary
2. /db/apply will be simplied
3. Template.__call__ will no longer be necessary