Enable uploading layer configurations using the Remote API

[gcuder]

Is your feature request related to a problem? Please describe.
I want to automate the upload of layer configurations for a certain project. Currently this is only semi-automatic as I always have to upload the layer.json using the frontend.

Describe the solution you'd like
It would be great to have the possibility to use an API call for this, just as described here

[reckart]

Can you explain in what case you need to create new layers automatically after project created / why you cannot already define the types at the time of the project creation (by uploading a pre-generated project ZIP file)?