inspect_cow: Add --show_raw_ops.

This bypasses CowReader and shows ops directly from CowParserV2. This
will come in handy once CowOperation is versioned and CowReader will be
translating from older versions to new versions.

Bug: 280529365
Test: inspect_cow
Change-Id: Icaeba86105c31c4dfe2812309a4028dd1d0248c0