Merge branch 'ds/status-with-sparse-index' into seen

Merge branch 'ds/status-with-sparse-index' into seen

"git status" codepath learned to work with sparsely populated index
without hydrating it fully.

* ds/status-with-sparse-index:
  fsmonitor: integrate with sparse index
  wt-status: expand added sparse directory entries
  status: use sparse-index throughout
  status: skip sparse-checkout percentage with sparse-index
  dir.c: accept a directory as part of cone-mode patterns
  unpack-trees: be careful around sparse directory entries
  unpack-trees: compare sparse directories correctly
  unpack-trees: preserve cache_bottom
  t1092: add tests for status/add and sparse files
  t1092: expand repository data shape
  sparse-index: include EXTENDED flag when expanding
  sparse-index: skip indexes with unmerged entries