This commit handles two things:
1) Move the local storage logic of the search panel into the documents
module.
2) This allows for a variety of optimisations now that we do not have to
constantly wait for a potential default value hidden in the storage.
This is why this commit also introduces a way for the search panel model
extension to sometimes return its query informations sooner than after
being completely loaded.
Task 2284207
Julien Mougenot
2524c7aaac