* Move interfaces to common location
Upcoming PRs are using these interfaces across packages. Move them to a
common location so multiple packages can use them without import cycles
etc.
* Allow adding newly created folders to the cache (#1131)
* New function to add folders to cache
Allow adding new folders to the cache. Automatically cache the paths for
the new folders. Also add the new function to the interface.
* Reuse the AddToCache function during population
* Wire up ability to back up a single subfolder of mail (#1132)
* Expand cache to return items in it
Required to allow matching an item's path to a selector as the selector
will not provide which paths it matches on easily.
* Function to get collections from cached folders
Returned collections match any matchers given for the folders
* Thread resolver through iterator functions
Allow the folder resolver to be used in all iterator functions. The
resolver will be tied to the current category and user.
* Choose between using resolver and making queries
Allow either using the resolver to get folders with matching names or
using queries to get them.
* Wire up resolver at entry point
Create a resolver instance for each user/category of data being
backedup.
* Preparation for changing how mail enumeration is done (#1157)
* Step towards redoing mail fetching
Pull out old way to get data into a new function and setup some helper
functions etc.
* Switch to pulling mail items folder by folder (#1158)
* Function to pull mail items given collections
Given a set of collections and IDs for those collections pull the mail
items for each collection.
* Create helper function to fetch mail
New helper function to fetch mail items. This goes through each folder
and gets the items for them individually.
* Wire up new way to fetch mail
Leaves fetch logic for other data types undisturbed.
* Tests for new mail fetching logic
Remove tests that were previously in iterators_test.go and move them to
graph_connector_test.go. These tests only had to do with mail logic.
Tests that handled all data types in iterators_test.go have been updated
to skip mail now.
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