collect fs stat for ext4

- This is to collect data to understand if e2fsck -f option
  can be dropped wholly based on information from fs.
- Ideally e2fsck should not fix fs if it was clean shutdown
  or if it is not enabling quota.
- The log is added to /dev/fscklogs/log and other system components
  can collect it later.

TODO: add mechanism to distinguish old vs new fs generation tool.

bug: 32246772
Test: reboot and check saved logs under different shutdown conditions (clean, non-clean)

Change-Id: Id00fad4c5f8ebbb9f9908164a1026e415df06721