Investigate evaluation improvement for subtrees with read access to all regular nodes/properties

Today permission evaluation contains a shortcut for evaluation of read access when a given session is known to have full read access on a given subtree i.e. including reading all access control content stored below that tree.

In case TreePermission.canReadAll() returns true the SecureNodeState will no longer create a permission-evaluating wrapper around child items.

However, due to the nature of the default access control management that allows for nested allow-deny entries, TreePermission.canReadAll() returns false unless the subject is known to have full administrative access.

This goal of this improvement is to investigate additional optimizations for cases where read-access to regular items is granted in a given subtree like it is e.g. the case of those paths that are defined to be always readable (see e.g. https://github.com/apache/jackrabbit-oak/blob/trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/security/authorization/AuthorizationConfigurationImpl.java#L107-L113)

cc: joerghoh, rma61870@adobe.com