Proof of Concept - Demonstrate OpenAPI::Modern plugin

[perlpunk]

Issue: https://progress.opensuse.org/issues/186675

Notes: When porting only single routes, they have to be specified explicitly. Once all routes are ported, there only needs to be one route per controller:

$api_public_r->any('/jobs*')->to('job#catchall');

Contra:

• Does not yet support application/x-www-form-urlencoded, so PUT/POST won't work. We would have to move to application/json requests
• Some dependencies not yet in Tumbleweed, even more not in 15.6

[Martchus]

We would have to move to application/json requests

This would be an API break. Maybe we should have the new routes under v2 then and leave the current API as-is.

[perlpunk]

This would be an API break. Maybe we should have the new routes under v2 then and leave the current API as-is.

Keep in mind that there is still the other, more mature plugin we want to try.