Add duration of individual migration; up and down

[mfridman]

This PR adds duration output to each individual up and down migration, e.g.,

Note, the duration is truncated down to 2. I found the default precision overly long.

2022/10/20 17:21:28 OK   00001_a.sql (44.74ms)
2022/10/20 17:21:28 OK   00002_b.sql (7.52ms)
2022/10/20 17:21:28 OK   00003_c.sql (35.31ms)
2022/10/20 17:21:28 OK   00004_d.sql (4.17ms)
2022/10/20 17:21:28 OK   00005_e.sql (37.76ms)
2022/10/20 17:21:28 OK   00006_f.sql (9ms)
2022/10/20 17:21:28 OK   00007_g.sql (37.31ms)    <- microseconds
2022/10/20 17:21:40 OK   00008_h.sql (12.04s)     <- seconds
2022/10/20 17:22:42 OK   00009_i.sql (1m2.04s)    <- minutes
2022/10/20 17:22:42 OK   00010_j.sql (36.66ms)
2022/10/20 17:22:42 OK   00011_k.sql (79.72ms)

cc @VojtechVitek let me know if the output is good enough.

Fix #388

[VojtechVitek]

I like this. Looks very readable :)

LGTM