[minor] add num stuck files to file breakdown
MINOR MERGE REQUEST
Overview
Add number of stuck chunks to file breakdown in siac.
https://asciinema.org/a/kcjXkqCC0EBzAWEDQVfvTYrD3
Add number of stuck chunks to file breakdown in siac.
https://asciinema.org/a/kcjXkqCC0EBzAWEDQVfvTYrD3