Use TypeIndexes in addition to VOID endpoint

[srosset81]

"Classical" SemApps instances have the possibility to deploy a VOID endpoint, which is used then by the data provider to find the containers based on the type of resources being requested.

On a Pod provider config, we cannot use a VOID endpoint because it would depend on each Pod. VOID endpoints use /.well-known URLs, and so we can have only one per domain name. As a consequence, we need to hard-code on the data provider config the containers that are available.

However, as soon as Pods supports TypeIndexes, we can use them instead of VOID to find the available containers.

Of course VOID should still be used when available.