Migrate CodebaseResource and DiscoveredPackage pk from id to uuid

[tdruez]

DiscoveredPackage already has a uuid field but it's not the pk
CodebaseResource has only a id

Note: we want to keep the id as pk, simply add the uuid for the URLs and reference the object.

[DhruviJ17]

@tdruez can I work on this?

[tdruez]

We do not rely on id PK in URLs anymore, 92d9c35