Allow templates to be added and edited via the API

[rory-wilson]

For deploying and moving between environments, it would be useful if templates could be edited or created via the REST API (or client) rather than a manual job.

[CrystalPea]

Hi Rory,

We are hoping to implement it as a part of API improvements work we just started, but it’s non-trivial, and we decided to build it in 2nd wave of improvements. Managing templates via API will hopefully be built late this year or early next year.
We will update everyone through our newsletter when it’s ready.

Your colleague Paul asked if we couldn't simply expose one method, so here is additional context:

This piece of work is more than exposing one method - when we do it, we do it properly - we write the V2 endpoints (that may need some additional validation) AND unit tests, we expose both creating AND updating AND archiving templates via API, AND we implement that for API clients, too, AND we need to write documentation for it all.