Merge branch...

Merge branch 'amiranda/78-there-s-no-way-to-select-the-adhoc-storage-type-when-calling-register_adhoc_storage' into 'main'

Resolve "There's no way to select the adhoc storage type when calling `register_adhoc_storage`"

This MR adds a `type` argument both to `ADM_register_adhoc_storage()` and 
`admire::register_adhoc_storage()` so that client code can properly select
the type of the instance to be registered.

Closes #78

See merge request !53