[!115] Implement a 'zfill' command inspired by pythons zfill
Merge branch 'feature/zfill-command' into 'master'
See merge request quality/dune-testtools!115
(cherry picked from commit 539c674d)
ecdad585 Implement a 'zfill' command inspired by pythons zfill 17dfe8f8 Add a unit test for zfill