packfile: introduce function to iterate through objects

Introduce a new function `packfile_store_for_each_object()`. This
function is equivalent to `odb_source_loose_for_each_object()`, except
that it:

  - Works on a single packfile store instead of working on the object
    database level. Consequently, it will only yield packed objects of a
    single object database source.

  - Passes a `struct object_info` to the callback function.

As such, it provides the same callback interface as we already provide
for loose objects now. These functions will be used in a subsequent step
to implement `odb_for_each_object()`.

The `for_each_packed_object()` function continues to exist for now, but
it will be removed at the end of this patch series.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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