btrfs: scrub: introduce helper to find and fill sector info for a scrub_stripe

The new helper will search the extent tree to find the first extent of a
logical range, then fill the sectors array by two loops:

- Loop 1 to fill common bits and metadata generation

- Loop 2 to fill csum data (only for data bgs)
  This loop will use the new btrfs_lookup_csums_bitmap() to fill
  the full csum buffer, and set scrub_sector_verification::csum.

With all the needed info filled by this function, later we only need to
submit and verify the stripe.

Here we temporarily export the helper to avoid warning on unused static
function.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>