Display time elapsed for each task

[romdr]

Display time elapsed for each task, instead of the total time (that is already displayed at the beginning of the line)

In the case of a task ground, the time displayed is the time elapsed by the whole group.

Example:

#alfred.yml
test.group:
  summary: sleep 1
  tasks: test.2 test.3

test.3:
  summary: sleep 3
  command: sleep 3

test.2:
  summary: sleep 2
  command: sleep 2

test.1:
  summary: sleep 1
  command: sleep 1

test:
  summary: sleep
  tasks: test.group test.1 test.2 test.3

$ alfred.exe test
[      0s] (10 May 19 16:37 PDT) [/tmp] test started [] sleep
[      0s] (10 May 19 16:37 PDT) [/tmp] test tasks test.group, test.1, test.2, test.3
[      0s] (10 May 19 16:37 PDT) [/tmp] test.group started [] sleep 1
[      0s] (10 May 19 16:37 PDT) [/tmp] test.group tasks test.2, test.3
[      0s] (10 May 19 16:37 PDT) [/tmp] test.2 started [] sleep 2
[      2s] (10 May 19 16:37 PDT) [/tmp] test.2 ✔ ok [] elapsed time '2s'
[      2s] (10 May 19 16:37 PDT) [/tmp] test.3 started [] sleep 3
[      5s] (10 May 19 16:37 PDT) [/tmp] test.3 ✔ ok [] elapsed time '3s'
[      5s] (10 May 19 16:37 PDT) [/tmp] test.group ✔ ok [] elapsed time '5s'
[      5s] (10 May 19 16:37 PDT) [/tmp] test.1 started [] sleep 1
[      6s] (10 May 19 16:37 PDT) [/tmp] test.1 ✔ ok [] elapsed time '1s'
[      6s] (10 May 19 16:37 PDT) [/tmp] test.2 started [] sleep 2
[      8s] (10 May 19 16:37 PDT) [/tmp] test.2 ✔ ok [] elapsed time '2s'
[      8s] (10 May 19 16:37 PDT) [/tmp] test.3 started [] sleep 3
[     11s] (10 May 19 16:37 PDT) [/tmp] test.3 ✔ ok [] elapsed time '3s'
[     11s] (10 May 19 16:37 PDT) [/tmp] test ✔ ok [] elapsed time '11s'

[romdr]

I didn't mean to merge the other changes (that break the CI build). I created a PR up to specifically the CL that introduced the elapsed time change. I probably need to make a new PR or fix that branch.