[Printers] Route to start printing

[dantetemplar]

Describe the feature

We need fastapi api with route to start printing. It should check whether file is pdf, if it is then prepare printing job and return id with meta (user should be able to preview printing details and decline job), otherwise try to convert to pdf and then return all needed data.

Suggested solution

Use fastapi UploadFile.

To get file extension you can use suffix of filename or puremagic (preferable).

For storing files before printing you may use tempfile.

Additional context

No response