Merge branch 'ps/odb-for-each-object'

Revamp object enumeration API around odb. * ps/odb-for-each-object: odb: drop unused `for_each_{loose,packed}_object()` functions reachable: convert to use `odb_for_each_object()` builtin/pack-objects: use `packfile_store_for_each_object()` odb: introduce mtime fields for object info requests treewide: drop uses of `for_each_{loose,packed}_object()` treewide: enumerate promisor objects via `odb_for_each_object()` builtin/fsck: refactor to use `odb_for_each_object()` odb: introduce `odb_for_each_object()` packfile: introduce function to iterate through objects packfile: extract function to iterate through objects of a store object-file: introduce function to iterate through objects object-file: extract function to read object info from path odb: fix flags parameter to be unsigned odb: rename `FOR_EACH_OBJECT_*` flags