pack-objects: add tracing for various packfile metrics

pack-objects: add tracing for various packfile metrics

As part of the multi-pack reuse effort, we will want to add some tests
that assert that we reused a certain number of objects from a certain
number of packs.

We could do this by grepping through the stderr output of
`pack-objects`, but doing so would be brittle in case the output format
changed.

Instead, let's use the trace2 mechanism to log various pieces of
information about the generated packfile, which we can then use to
compare against desired values.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>