Data provider: allow to pass only slug, not full URI, as id

[srosset81]

We could allow to pass only the resource slug (or UUID) as the id.

In that case, the URL would automatically be guessed based on the container of the default server.

It would throw an error if the default server doesn't have a container with this resource type, or if there are more than one container.

We would need to indicate if the resourcesWithContainerPath option of the LdpService is set to false, in which case the container path will always be the root path.

Note that we can also do without this option (see #636), it is only to make life easier for developers.

[simonLouvet]

Why do you want to remove the resource from the url sent to data provider. Isn't removing the root of the url as in #636 enough?

[srosset81]

My proposal is the same as #636, except that I want to code it directly in the data provider.

[simonLouvet]

Ok.
I would like this type of behaviour to be managed by middleware/adapter/proxy/plugin/mixin on the dataprovider for modularity/maintenance. I can't find it in the documentation.