Allow querying collections of primitive type instances similar to other collections

Collections of entities and complex type instances are now treated equally, but collections of primitive values are somewhat neglected. They do allow the path suffix /$count, and the query options $count, $top and $skip are straight-forward.

For $filter and $orderby we need one tiny generalization: we currently allow common expressions within the lambda operators any() and all() to use $it for addressing the current entity, and we can use that to filter collections of primitive values:

GET ~/Customers(1)/EmailAddresses?$filter=endswith($it,'.com')

This increased flexibility is also useful for querying collections of entities:

GET ~/Employees?$filter=$it eq Manager

Would return all employees who are their own manager.

This also allows retrieving the entity for a given reference:

GET ~/Employees?filter=$it eq