Make get(), put(), delete() return proper builders

[Mallets]

subscribe(), queryable(), and publish() return respectively SubscriberBuilder, QueryableBuilder, PublisherBuilder.

For consistency, get(), put(), delete() should also return GetBuilder, PutBuilder, DeleteBuilder types. This is particular relevant for the different types returned by put() and delete() since some configs used in put() operations don’t make sense for delete() ones.

Tasks:

• [x] GetBuilder
• [x] PutBuilder
• [x] DeletBuilder

[Mallets]

https://github.com/eclipse-zenoh/zenoh/pull/255 has been merged into api-changes branch. This issue will be automatically closed once api-changes is merged into master.

[Mallets]

Merged into master.