LP#1873048: add scoped retrieve perms for booking resource types and resources

LP#1873048: add scoped retrieve perms for booking resource types and resources

In the XUL client, when selecting a resource type, the list was limited
by owning library.  But in the web client, the list would show all
resource types across all libraries.  This commit addresses that
regression by adding a new VIEW_BOOKING_RESOURCE_TYPE permission with
context_field in the IDL.  That way, users only see resource types owned
by org units where they have the permission.

While we're at it, a new VIEW_BOOKING_RESOURCE perm is also added for
resources.

Signed-off-by: Jeff Davis <jdavis@sitka.bclibraries.ca>