Allow to download versions with 1 or 2 digits (reconciliate with semver versions)

Example:

https://connect.nuxeo.com/nuxeo/site/marketplace/package/nuxeo-csv?version=11.5.0-SNAPSHOT

Package version is 11.5-SNAPSHOT (in package code).

The system (nuxeoctl, Connect, etc.) will handle it as 11.5.0-SNAPSHOT.

When a request is made to 11.5-SNAPSHOT, it should be resolved as 11.5.0-SNAPSHOT for consistency and reliability of the API.

For instance:

https://connect.nuxeo.com/nuxeo/site/marketplace/package/nuxeo-csv/download?version=11.5-SNAPSHOT 

This download will fail. That is an issue for automation because the Platform code states 11.5-SNAPSHOT.

It would help not having to make the version 3 digits for being able to call the download.