feat: add time management

[MikaelVallenet]

The goal was to add a way to indicate the time required for a task from the github issue Resolve #545 .
For this i propose this feature which allows to indicate time in issues.

To use this feature you just need to include the keyword time followed by a space and the time value.

My feature takes into account different time units:

Colonne 1	Colonne 2
w	weeks
d	day
h	hours
m	minutes

Example of an issue with the indicated time:

Then i add a hourglass component icon in JS and display after that the time

Here is before implementation

Here is after implementation

┆Issue is synchronized with this Trello card

[codecov]

Codecov Report

Merging #547 (d8e2137) into master (0fdc89f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #547   +/-   ##
=======================================
  Coverage   27.95%   27.95%           
=======================================
  Files           6        6           
  Lines         440      440           
=======================================
  Hits          123      123           
  Misses        315      315           
  Partials        2        2           

Flag	Coverage Δ
unittests	27.95% <ø> (ø)

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[github-actions]

🎉 This PR is included in version 3.13.0 🎉

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