* add method CanReadAllRules to rule authorization service
* add alias type Namespace for Folder in ngalert's models package. It implements the Namespacer interface that is used by authz logic
* update state history's backends to authorize access to rules.
* update Loki to add folders UIDs to query.
* Update BuildLogQuery to drop filter by folders if it's too long and fall back to in-memory filtering.
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