Add Authorize header configuration for Confluence app for From URL option

[AlexisColes]

Problem Presently, at work we store our draw.io diagrams in the organisation's git repo in azure devops. I can generate a url that will give us the raw draw.io data.. However, if you want to embed those diagrams on a Confluence page, you are currently unable to do that with the from URL option.

Describe the solution you'd like I would like to be able to authorise the Confluence cloud plugin to access our azure devops repos. I would suggest allowing us to supply the value for an authorize header would be a very flexable option for people.

Having constantly up to date version controlled diagrams in your Confluence docs would be amazing!