Refactors and reworks the LibraryContentBlock so that its sync-from-library operations are asynchronous and work with V2 content libraries. This also required us to make library_content block duplication asynchronous, as that involves syncing from the source library. For the sake of clarity, this PR includes two major method renames: * update_children(...) -> sync_from_library(...) * refresh_library(...) -> sync_from_library(upgrade_to_latest=True, ...) an an XBlock HTTP handler rename: /refresh_children -> /upgrade_and_sync There are still a couple issues with import or duplication of library_content blocks referencing V2 libraries other than latest. These will be resolved in an upcoming PR. Part of: https://openedx.atlassian.net/wiki/spaces/COMM/pages/3820617729/Spec+Memo+Content+Library+Authoring+Experience+V2 Follow-up work: https://github.com/openedx/edx-platform/issues/33640 Co-authored-by: Connor Haugh <chaugh@2u.com> Co-authored-by: Eugene Dyudyunov <evgen.dyudyunov@raccoongang.com>
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