Sample dataset for collections and scopes

Provide a sample dataset with named collections and scopes that is bundled with the software so users can play with the product. This is a huge undertaking and will be addressed in phases:

• Beta (nov): Given the number of examples in Server docs, it is important to ensure that we do not break backward compatibility and older examples continue to work. Hence, the plan is to update`travel-sample` to include named collections (and time-permitting, a named scope). Goal is to demo first N1QL query by Beta. 
• Beta refresh (Feb '21): Update the `travel-sample` dataset with new data so we can use it to demo all other services as well.
• GA: Incorporate feedback and ensure all samples and any dependencies are updated as per the updated `travel-sample` dataset.